TITLE: GCN CIRCULAR NUMBER: 26917
SUBJECT: GRB 200128B: AGILE/MCAL detection of a burst
DATE: 20/01/28 15:31:14 GMT
FROM: Alessandro Ursi at INAF/IAPS

A. Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M. Cardillo, C. Casentini, G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna), M. Pilia (INAF/OA-Cagliari), F. Longo (Univ. Trieste and INFN Trieste), report on behalf of the AGILE Team:

The AGILE mini-calorimeter (MCAL) detected a short hard burst at T0 = 2020-01-28 12:23:29.98 +/- 0.01 s (UTC).

The event triggered the 64 ms MCAL logic timescale and lasted about 0.10 s, releasing a total number of ~90 counts in the detector (in the 0.4-100 MeV energy range), above an average background rate of ~500 counts / s.

The light curve shows a single peak and can be found at http://www.agilescienceapp.it/notices/GRB_066265_507299009.979947.png.

The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress.

TITLE: GCN CIRCULAR NUMBER: 26123
SUBJECT: GRB 191031D: AGILE/MCAL observations
DATE: 19/11/01 09:11:45 GMT
FROM: Alessandro Ursi at INAF/IAPS

A. Ursi (INAF/IAPS), F. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M. Cardillo, C. Casentini, G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), report on behalf of the AGILE Team:

The AGILE Mini-CALorimeter (MCAL) detected the short GRB 191031D at T0 = 2019-10-31 21:23:28.17 +/- 0.01 s (UTC), already detected by Fermi/GBM (GCN #26111), Swift (D'Elia et al., 2019; GCN #26112), and INTEGRAL/SPIACS (trignum=8402).

The event lasted about 0.2 s and released a total number of ~430 counts in the detector (in the 0.4-100 MeV energy range), above an average background rate of 544 counts / s.

The light curve shows a single peak episode and can be found at http://www.agilescienceapp.it/notices/GRB_064997_499641808.174626.png.

The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress.

TITLE: GCN CIRCULAR NUMBER: 25859
SUBJECT: GRB 190928A: AGILE/MCAL detection of a burst
DATE: 19/09/28 18:03:46 GMT
FROM: Alessandro Ursi at INAF/IAPS

A. Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M. Cardillo, C. Casentini, G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna), M. Pilia (INAF/OA-Cagliari), F. Longo (Univ. Trieste and INFN Trieste), report on behalf of the AGILE Team:

AGILE detected a long burst at T0 = 2019-09-28 13:13:48.39 +/- 0.01 s (UTC). The event is visible in the scientific ratemeters (RMs) of the Super-AGILE (SA; 18-60 keV), Anti-Coincidence (AC; 50-200 keV), and Mini-CALorimeter (MCAL; 0.4-100 MeV) detectors. Their light curves show a multi-peaked profile, lasting ~20 s and releasing ~2,200 counts in the SA RMs, lasting ~30 s and releasing ~160,000 counts in the AC RMs, and lasting ~20 s and releasing ~73,200 counts in the MCAL RMs. The ratemeters light curves can be found at http://www.agilescienceapp.it/notices/GRB_064516_496761236.785171_RM.png.

The event also triggered two Mini-Calorimeter (MCAL) data acquisitions (in the 0.4-100 MeV energy range). Additional analysis of the AGILE data is in progress.

TITLE: GCN CIRCULAR NUMBER: 24363
SUBJECT: GRB 190501A: refined position from AGILE/GRID analysis
DATE: 19/05/01 17:32:13 GMT
FROM: Francesco Verrecchia at ASDC

F. Verrecchia, F. Lucarelli (SSDC, and INAF/OAR), G. Piano (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Giuliani (INAF/IASF-Mi), M. Cardillo, C. Casentini, A. Ursi (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR), Y. Evangelista (INAF/IAPS), A. Bulgarelli, V. Fioretti, N. Parmiggiani, F. Fuschino (INAF/OAS), M. Marisaldi (INAF/OAS, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), F. Longo (Univ. Trieste and INFN Trieste), I. Donnarumma (ASI), report on behalf of the AGILE Team:

We refined the position of the long GRB 190501A detected by the Gamma-Ray Imaging Detector (GRID) of AGILE (Lucarelli et al., GCN #24361) and previously reported by Ursi et al., GCN #24360.

A preliminary maximum likelihood analysis integrating from T0 to T0+500 s yields a detection at 7 sigma with an average flux of F(E> 30 MeV)=(50+/-15)e-05 ph/cm^2/s, with the positional error box centered at R.A., Dec. (J2000) = 172.8, 64.1 deg with a mean radius of 0.8 deg (95% stat. c.l.) [ Galactic coordinates (l,b)=(136.6, 50.8) deg ].

This is among the most intense gamma-ray flux ever detected by AGILE from a GRB.

These measurements were obtained with AGILE observing a large portion of the sky in spinning mode. Additional analysis of AGILE data is in progress.

TITLE: GCN CIRCULAR NUMBER: 24361
SUBJECT: GRB 190501A: AGILE/GRID detection
DATE: 19/05/01 12:17:54 GMT
FROM: Fabrizio Lucarelli at SSDC/INAF-OAR

The Gamma-Ray Imaging Detector (GRID) of AGILE detected a gamma-ray transient temporally coincident with the long bright GRB 190501A reported by Ursi et al., GCN #24360. Given the rarity of this transient, we consider it the gamma-ray counterpart of GRB 190501A.

A preliminary GRID analysis in the energy range 30 MeV - 1 GeV shows a detection with a statistical significance of about 18 sigma, at the sky position R.A., Decl. (J2000): 174,+65 +/- 5 deg (Galactic coordinates l,b: 135,+50 deg), over a time integration of 20 s starting from the T0 of GRB 190501A.

The preliminary estimated position is below the GRID 30 deg off-axis angle.

These measurements were obtained with AGILE observing a large portion of the sky in spinning mode. Additional analysis of AGILE data is in progress.

TITLE: GCN CIRCULAR NUMBER: 24360
SUBJECT: GRB 190501A: AGILE/MCAL and scientific ratemeters detection of a burst
DATE: 19/05/01 10:32:09 GMT
FROM: Alessandro Ursi at INAF/IAPS

A. Ursi (INAF/IAPS), F. Verrecchia, F. Lucarelli (SSDC, and INAF/OAR), N. Parmiggiani (INAF/OAS-Bologna), C. Pittori (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, G. Piano (INAF/IAPS), A. Bulgarelli, V. Fioretti, F. Fuschino, (INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:

AGILE detected a long burst at T0 = 2019-05-01 05:23:23.58 +/- 0.01 s (UTC).

The event is visible in the scientific ratemeters (RMs) of the Super-AGILE (SA, 18-60 keV), Anti-Coincidence (AC, 50-200 keV), and Mini-Calorimeter (MCAL, 0.4-100 MeV) detectors. Their light curves show a multi-peaked FRED profile, lasting ~24 s and releasing ~11200 counts in the SA RMs, lasting ~15 s and releasing ~2000 counts in the AC RMs, and lasting ~18 s and releasing ~20200 counts in the MCAL RMs. The ratemeters light curves can be found at http://www.agilescienceapp.it/notices/GRB_062362_483773003.584545_RM.png.

The event also triggered a Mini-Calorimeter (MCAL) data acquisition lasting ~8.6 s and releasing a total number of ~10140 counts in the detector (in the 0.4-100 MeV energy range). The MCAL light curve can be found at: http://www.agilescienceapp.it/notices/GRB_062362_483773003.584545.png.

Further analysis of the Gamma-Ray Imaging Detector (GRID) data is still in progress.

The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress.

TITLE: GCN CIRCULAR NUMBER: 23930
SUBJECT: GRB 190305A: AGILE/MCAL detection of a burst
DATE: 19/03/05 14:39:05 GMT
FROM: Alessandro Ursi at INAF/IAPS

A. Ursi (INAF/IAPS), M. Cardillo, C. Casentini (INAF/IAPS), C. Pittori(SSDC, and INAF/OAR), A. Bulgarelli, N. Parmiggiani (INAF/OAS-Bologna), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, Y. Evangelista, G. Piano (INAF/IAPS), F. Lucarelli, F. Verrecchia (SSDC, and INAF/OAR), V. Fioretti, F. Fuschino (INAF/OAS-Bologna), M. Marisaldi(INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:

The AGILE Mini-CALorimeter (MCAL) detected a burst at T0 = 2019-03-05 13:05:19.34 +/- 0.01 s (UTC).

The event lasted about 1.8 s and released a total number of ~8040 counts in the detector (in the 0.4-100 MeV energy range), above an average background rate of 620 counts / s. The burst is also clearly visible in the scientific ratemeters of the Anti-Coincidence (AC, 50-200 keV), SuperAGILE (SA, 18-60 keV) and MiniCALorimeter (MCAL, 0.4-100 MeV) detectors.

Further analysis is still in progress.

The AGILE-MCAL detector has a full solid angle acceptance, and is operational in the range 0.4 - 100 MeV.

TITLE: GCN CIRCULAR NUMBER: 23835
SUBJECT: GRB 190202A: AGILE ratemeters detection
DATE: 19/02/02 13:29:32 GMT
FROM: Francesco Verrecchia at ASDC

F. Verrecchia (SSDC, and INAF/OAR), A. Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M. Cardillo, Y. Evangelista, G. Piano (INAF/IAPS), C. Pittori, F. Lucarelli, (SSDC, and INAF/OAR), F. Longo (Univ. Trieste and INFN Trieste), A. Bulgarelli, V. Fioretti, F. Fuschino (INAF/OAS-Bologna), A. Argan (INAF/IAPS), A. Giuliani (INAF/IASF-Mi), M. Marisaldi (INAF/OAS, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), report on behalf of the AGILE Team:

AGILE detected the long GRB 190202A first reported by Swift in Lien et al., GCN 23830, in the scientific ratemeters of the Anti-Coincidence (50-200 keV), Super-AGILE (SA; 18-60 keV) and Mini-Caloremeter (MCAL; 0.4-100 MeV) detectors.

The event position was not exposed by the AGILE Gamma-Ray Imaging Detector.

The low significance event lasted about 15s in the three light curves with the SA one starting about 8 s before the trigger time and the MCAL one about 10 s before..

Further analysis is still in progress.

TITLE: GCN CIRCULAR NUMBER: 23752
SUBJECT: GRB 190117A: AGILE/MCAL detection of a burst
DATE: 19/01/17 19:01:06 GMT
FROM: Alessandro Ursi at INAF/IAPS

A.Ursi (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, G. Piano (INAF/IAPS), F. Lucarelli, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani(INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:

The AGILE Mini-CALorimeter (MCAL) detected a burst at T0 = 2019-01-17 14:36:49.01 +/- 0.01 s (UTC).

In the 0.4-100 MeV energy range, the event lasted about 0.6 s and released a total number of ~530 counts in the detector, above an average background rate of 540 counts / s.

The GRB is clearly detected also by the AGILE scientific ratemeters: in particular, by the Super-AGILE (20-60 keV), Anti-Coincidence (50-200 keV), and MCAL (0.4-100 MeV) ratemeters.

Further analysis is still in progress.

The AGILE-MCAL detector has a full solid angle acceptance, and is operational in the range 0.4 - 100 MeV.

TITLE: GCN CIRCULAR NUMBER: 23712
SUBJECT: GRB 190114C: AGILE/MCAL detection
DATE: 19/01/15 12:13:44 GMT
FROM: Alessandro Ursi at INAF/IAPS

A. Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), N. Parmiggiani (INAF/OAS-Bologna), F. Longo (Univ. Trieste and INFN Trieste), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino (INAF/OAS-Bologna), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:

The AGILE Mini-CALorimeter (MCAL) detected the GRB 190114C at T0 = 2019-01-14 20:57:02.26 +/- 0.01 s (UTC), which was also detected by Swift/BAT-XRT (Gropp et al., GCN #23688), MASTER (Tyurina et al., GCN #23690), Pan-STARRS (de Ugarte Postigo et al., GCN #23692), NOT (Selsing et al., GCN #23695), OASDG (Izzo et al., GCN #23699), GROND (Bolmer et al., GCN #23702), Fermi/GBM (Hamburg et al., GCN #23707), Fermi/LAT (Kocevski et al., GCN #23709), X-shooter (Kann et al., GCN #23710), and representing the first GRB ever detected by ground-based Cherenkov telescopes (MAGIC, Mirzoyan et al., GCN #23701).

In the 0.4-100 MeV energy band, the event lasted T90=6.2 s and released a total number of ~32600 counts in the detector, above an average background rate of about 700 Hz. The light curve shows several peaks, which can be grouped in three episodes, characterized by different energy profiles: the first and third episodes are mostly constituted of counts with energies < 1.4 MeV, whereas the second central episode exhibits a substantial fraction of high-energy counts with energies > 1.4 MeV. The AGILE/MCAL light curve can be viewed at: http://www.agilescienceapp.it/results/wp-content/uploads/2019/01/GRB190114C_MCAL-1.png.

The time-integrated spectrum of the first episode (from T0 to T0+2.5 s) can be fitted in the energy range [0.4-2 MeV] with a simple power law with ph.ind.=2.55 -0.07/+0.08, resulting in a reduced chi-square of 1.56 (21 d.o.f.). The burst fluence in the same energy range and time interval is 2.11e-05 erg/cm^2 (90% confidence level).

The time-integrated spectrum of the second episode (from T0+2.5 s to T0+4.8 s) can be fitted in the energy range [0.4-60 MeV] with a broken power law with alpha=1.46 -0.35/+0.41, beta=2.53 -0.05/+0.07, and a break energy of 750 +56/-110 keV, resulting in a reduced chi-square of 1.44 (46 d.o.f.). This episode is possibly made by several spectral components. The burst fluence in the same energy range and time interval is 1.31e-4 erg/cm^2 (90% confidence level).

The time-integrated spectrum of the third episode (from T0+4.8 s to T0+6.2 s) can be fitted in the energy range [0.4-2 MeV] with a simple power law with ph.ind.=2.95 -0.09/+0.10, resulting in a reduced chi-square of 1.11 (21 d.o.f.). The burst fluence in the same energy range and time interval is 1.11e-05 erg/cm^2 (90% confidence level).

The GRB is clearly detected also by the AGILE scientific ratemeters: in particular, by the Super-AGILE (20-60 keV), Anti-Coincidence (50-200 keV), and MCAL (0.4-100 MeV) ratemeters.

Further analysis is still in progress.

The AGILE-MCAL detector has a full solid angle acceptance, and is operational in the range 0.4 - 100 MeV.

TITLE: GCN CIRCULAR NUMBER: 23600
SUBJECT: GRB 190103A: AGILE/MCAL detection of a burst
DATE: 19/01/03 20:28:34 GMT
FROM: Alessandro Ursi at INAF/IAPS

A.Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:

The AGILE Mini-CALorimeter (MCAL) detected a burst at T0 = 2019-01-03 16:42:15.05 +/- 0.01 s (UTC).

The event lasted about 4.7 s and released a total number of ~5426 counts in the detector (in the 0.4-100 MeV energy range), above an average background rate of about 700 Hz. The light curve shows two peak episodes.

The GRB is clearly detected also by the AGILE scientific ratemeters; in particular, by the Super-AGILE (20-60 keV), Anti-Coincidence (50-200 keV), and MCAL (0.4-100 MeV) ratemeters.

Further analysis is still in progress.

The AGILE-MCAL detector has a full solid angle acceptance, and is operational in the range 0.4 - 100 MeV.

TITLE: GCN CIRCULAR NUMBER: 23560
SUBJECT: GRB 181225A: AGILE/MCAL detection of a burst
DATE: 18/12/25 16:22:35 GMT
FROM: Alessandro Ursi at INAF/IAPS

A. Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:

The AGILE Mini-CALorimeter (MCAL) detected a short burst at T0 = 2018-12-25 11:44:11.76 +/- 0.01 s (UTC). The event lasted about 1.2 s and released a total number of ~1580 counts in the detector (in the 0.4-100 MeV energy range), above an average background rate of 750 counts / s.

Further analysis is still in progress.

The AGILE-MCAL detector has a full solid angle acceptance, and is operational in the range 0.4 - 100 MeV..

TITLE: GCN CIRCULAR NUMBER: 23429
SUBJECT: GRB 181121A: AGILE/MCAL detection of a burst
DATE: 18/11/22 08:33:17 GMT
FROM: Alessandro Ursi at INAF/IAPS

A.Ursi (INAF/IAPS), F. Verrecchia (SSDC, and INAF/OAR), N. Parmiggiani (INAF/IASF-Bo), A. Argan, M. Cardillo, Y. Evangelista, G. Minervini, G. Piano (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), F. Lucarelli, C. Pittori, (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino (INAF/IASF-Bo), M. Marisaldi (INAF/IASF-Bo, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:

The AGILE Mini-CALorimeter (MCAL) detected a short burst at T0 = 2018-11-21 20:43:36.283 +/- 0.01 s (UTC).

The AGILE Mini-CALorimeter (MCAL) detector high time resolution data acquisition was triggered twice by the GRB on sub-millisecond and 16 ms timescales.

The light curve shows a sharp peak lasting about 0.16 s, that released a total number of ~334 counts in the detector (in the 0.4-100 MeV energy range), above an average background rate of 573 counts / s. Two weaker pulses are present at T0+0.32 s and T0+0.67 s.

The GRB is clearly detected also by AGILE scientific ratemeters; in particular, by the Super-AGILE (20-60 keV), **Anti-Coincidence (50-200 keV), and MCAL (0.4-100 MeV) ratemeters.

Further analysis is still in progress.The AGILE-MCAL detector has a full solid angle acceptance, and is operational in the range 0.4 - 100 MeV.

TITLE: GCN CIRCULAR NUMBER: 23242
SUBJECT: GRB 180914B: AGILE/MCAL refined analysis
DATE: 18/09/16 18:26:38 GMT
FROM: Alessandro Ursi at INAF/IAPS

A. Ursi (INAF/IAPS), F. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), F. Longo (Univ. Trieste and INFN Trieste), A. Argan, M. Cardillo, Y. Evangelista, G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS), M. Marisaldi (INAF/OAS, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:

We present a refined analysis of the long GRB 180914B detected by AGILE/MCAL (Ursi et al., GCN #23226), AGILE/GRID (Verrecchia et al., GCN #23231), Fermi/LAT (Bissaldi et al., GCN #23232), and Konus-Wind (Frederiks et al., GCN #23240), whose afterglow has been so far detected by Swift/XRT (D'Ai et al., GCN #23236) and Swift/UVOT (Kuin et al., GCN #23241), KAIT (Zheng & Filippenko, GCN #23237), RATIR (Troja et al., GCN #23238), and OAJ (de Ugarte Postigo et al., GCN #23239).

The AGILE Mini-CALorimeter (MCAL) detector high time resolution data acquisition was triggered twice by the GRB on sub-millisecond and 16 ms timescales.

A first GRB peak triggered complete MCAL data acquisition, starting at T1 = 2018-09-14 18:23:02.22 +/- 0.01 s (UTC) and ending at about T1+6.4 s, and lasted the whole duration of the acquisition. The time-integrated spectrum measured between T1 and T1+6.4 s can be fitted in the energy range 0.5-40 MeV with a power law with photon index 1.74 0.13/+0.06 and a cut-off energy of 2.35 -2.2/+1.54 MeV, with a reduced chi-square of 1.13 (66 d.o.f.). The burst fluence in the same energy range and time interval is 2.4e-04 erg/cm^2 (90% confidence level).

After ~85 s, a second GRB peak triggered complete MCAL data acquisition, starting at T2 = 2018-09-14 18:24:27.84 +/- 0.01 s and ending at about T2+6.4, and lasted about 2.7 s. The time-integrated spectrum measured between T2 and T2+2.7 s can be fitted in the 0.5-40 MeV energy range with a simple power law with ph.ind. = 2.13 -0.07/+0.08 and a reduced chi-square of 1.23 (68 d.o.f.). The corresponding fluence is 1.94e-05 erg/cm^2 (90% confidence level).

The AGILE-MCAL detector has a full solid angle acceptance, and is operational in the range 0.4 - 100 MeV. This observation was done with the MCAL trigger capability set to a reduced mode with substantial TM constraints, and the Super-AGILE imaging being turned-off. A substantially enhanced AGILE instrument configuration is foreseen to be implemented shortly.

TITLE: GCN CIRCULAR NUMBER: 23226
SUBJECT: GRB 180914B: AGILE/MCAL detection of a burst
DATE: 18/09/14 22:37:55 GMT
FROM: Alessandro Ursi at INAF/IAPS

A. Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, Y. Evangelista, G. Minervini, G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS), M. Marisaldi (INAF/OAS, and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:

The AGILE Mini-CALorimeter (MCAL) detected a long burst at T0 = 2018-09-14 18:23:02.22 +/- 0.01 s (UTC). The event lasted T90 = 5.8 s (in the 0.4-100 MeV energy range), consisting of two broad pulses, and released a total number of ~25,000 counts in the detector, above an average background rate of ~1250 counts / s. Further analysis is still in progress.

The AGILE-MCAL detector has a full solid angle acceptance, and is operational in the range 0.4 - 100 MeV.

TITLE: GCN CIRCULAR NUMBER: 22321
SUBJECT: GRB 180111A: AGILE/MCAL detection
DATE: 18/01/12 00:02:25 GMT
FROM: Francesco Verrecchia at ASDC

F. Verrecchia (SSDC and INAF/OAR), A. Trois (INAF/OA-Cagliari), A.Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), N. Parmiggiani (INAF/IASF-Bo), C. Pittori (SSDC and INAF/OAR), M. Marisaldi (INAF/IASF-Bo and Bergen University), F. Longo (Univ. Trieste and INFN Trieste), A. Bulgarelli (INAF/IASF-Bo), M. Cardillo (INAF/IAPS), F. Lucarelli (SSDC and INAF/OAR), M. Pilia (INAF/OA-Cagliari), G. Piano (INAF/IAPS), I. Donnarumma (ASI), G. Minervini, A. Argan, Y. Evangelista (INAF/IAPS), V. Fioretti, F. Fuschino (INAF/IASF-Bo), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:

The AGILE Mini-CALorimeter (MCAL) detected at T0 = 2018-01-11 16:42:06.0 +/- 0.02 UTC the long GRB 180111A reported by Swift (Lien et al., GCN 22318), in the acquired data interval (following an internal trigger) started at T1=16:42:05.50 UTC and ended at 16:42:12.40 UTC. The MCAL light curve shows three main peaks starting at T0-0.15 s till ~6 s, with the main part within T0-0.10 s and T0+5.40 s. The main GRB interval released a total number of ~5537 counts at E>400 keV in the detector, above an average background rate of 18 counts/32ms.

The AGILE-MCAL detector has a full solid angle acceptance, and is operational in the range 0.4 - 100 MeV.

TITLE: GCN CIRCULAR NUMBER: 22288
SUBJECT: GRB 171227A: AGILE/MCAL detection
DATE: 17/12/27 18:34:44 GMT
FROM: Francesco Verrecchia at ASDC

F. Verrecchia (SSDC and INAF/OAR), A.Ursi (INAF/IAPS), A. Trois(INAF/OA-Cagliari), C. Pittori (SSDC and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M. Marisaldi (INAF/IASF-Bo and Bergen University), N. Parmiggiani (INAF/IASF-Bo), F. Longo (Univ. Trieste and INFN Trieste), A. Bulgarelli (INAF/IASF-Bo), M. Cardillo, M. Pilia (INAF/OA-Cagliari), G. Piano (INAF/IAPS), I. Donnarumma (ASI), G. Minervini, A. Argan, Y. Evangelista (INAF/IAPS), F. Lucarelli (SSDC and INAF/OAR), V. Fioretti, F. Fuschino (INAF/IASF-Bo), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:

The AGILE Mini-CALorimeter (MCAL) detected a long burst at T0 = 2017-12-27 00:00:30.00 +/- 0.01 UTC in the acquired data interval (following an internal trigger) started at T1=00:00:29.00 UTC and ended at 00:00:46.50 UTC. The MCAL light curve shows a multi-peaked structure, with the main part within T0+0.70 s and T0+5.50 s and a second short peak at T0+10.50 s. The main GRB interval released a total number of ~28190 counts at E>400 keV in the detector, above an average background rate of 23 counts/32ms.

The AGILE-MCAL detector has a full solid angle acceptance, and is operational in the range 0.4 - 100 MeV.

TITLE: GCN CIRCULAR NUMBER: 21689
SUBJECT: GRB 170825A: AGILE/MCAL Detection
DATE: 17/08/25 12:23:09 GMT
FROM: Francesco Verrecchia at ASDC

M. Cardillo, A.Ursi (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), N. Parmiggiani (INAF/IASF-Bo), F. Longo (Univ. Trieste and INFN Trieste), F. Verrecchia (SSDC and INAF/OAR), A. Bulgarelli (INAF/IASF-Bo), C. Pittori (SSDC and INAF/OAR), M. Pilia (INAF/OA-Cagliari), G. Piano (INAF/IAPS), I. Donnarumma (ASI), G. Minervini, A. Argan, Y. Evangelista (INAF/IAPS), F. Lucarelli (SSDC and INAF/OAR), A. Zoli, V. Fioretti, F. Fuschino (INAF/IASF-Bo), A. Trois (INAF/OA-Cagliari) M. Marisaldi (INAF/IASF-Bo and Bergen University), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:

The AGILE Mini-CALorimeter (MCAL) detected a short burst at T0 = 2017-08-25 02:19:49 UTC included in the acquisition (following an internal trigger) started at T1=02:21:27 UTC and ended at 02:21:34 UTC. The MCAL light curve shows a sharp single peak, that lasted about 32 ms and released a total number of ~48 counts at E>400 keV in the detector, above an average background rate of 19 counts/32ms.

The AGILE-MCAL detector has a full solid angle acceptance, and is operational in the range 0.4 - 100 MeV.

TITLE: GCN CIRCULAR NUMBER: 20545
SUBJECT: GRB 170127C (Fermi/GBM trigger 507173752): AGILE analysis
DATE: 17/01/27 17:15:24 GMT
FROM: Francesco Verrecchia at ASDC <francesco.verrecchia@asdc.asi.it>

A. Ursi (INAF/IAPS), P. Munar-Adrover (INAF/IAPS), F. Verrecchia (ASDC and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), Y. Evangelista (INAF/IAPS), F. Lucarelli (ASDC and INAF/OAR), F. Fuschino (INAF/IASF-Bo), I. Donnarumma (INAF/IAPS), G. Minervini (INAF/IAPS), M. Marisaldi (INAF/IASF-Bo and Bergen University), A. Bulgarelli, V. Fioretti (INAF/IASF-Bo), C. Pittori (ASDC and INAF/OAR), G. Piano, A. Argan, E. Del Monte, L. Pacciani (INAF/IAPS), M. Cardillo (INAF/OA-Arcetri and INAF/IAPS), A. Giuliani (INAF/IASF-Mi), M. Pilia, A. Trois (INAF/OA-Cagliari), F. Longo (Univ. Trieste and INFN Trieste), report on behalf of the AGILE Team:

We performed an analysis of AGILE data of the GRB 170127C (Fermi/GBM trigger num 507173752; GCN #20543), which occurred at 2017-01-27 01:35:47.79 UTC.

The Mini-CALorimeter (MCAL), sensitive in the energy range from 400 keV to 100 MeV, detected a short burst at T0 = 2017-01-27 01:35:47.9294 UTC, that triggered both the on-board 16 ms and 64 ms timescale hardware logic system. The MCAL light curve shows a sharp single peak, that lasted about 0.13 s and released a total number of ~980 counts above 400 keV in the detector, above an average background rate of 590 counts/s.

The time-integrated spectrum measured between T0 and T0+0.13 s can be fit in the energy range 0.5 - 20 MeV with a power law with high-energy cut-off at 1.63 MeV, with photon index -1.64±0.19 and reduced chi-squared 1.08 (18 d.o.f.). As observed by MCAL, the burst fluence in the same energy range and time interval is 1.20±0.01e-6 erg cm-2. All quoted errors are at 90% confidence levels.

SuperAGILE, sensitive in the energy range 18 to 60 keV, also clearly detected the burst with its ratemeters.

TITLE: GCN CIRCULAR NUMBER: 20525
SUBJECT: GRB 170115B: AGILE/SuperAGILE localisation
DATE: 17/01/25 15:51:18 GMT
FROM: Ettore Del Monte at IASF/INAF <sa.grb@iaps.inaf.it>

Y. Evangelista, L. Pacciani, E. Del Monte and I. Donnarumma(INAF/IAPS), A. Trois (INAF/OAC) on behalf of the AGILE Team, report:

SuperAGILE localised the long-duration GRB 170115B (Hamburg et al., GCN 20463; McEnery et al., GCN 20464; Sharma et al., GCN 20466; Xiao et al., GCN 20469; Verrecchia et al., GCN 20474; Frederiks et al., GCN 20476, Shimizu et al., GCN 20483) on 15 January 2017, at 17:49:14 UT.

The event had a duration of about 50.0 s in the 18-60 keV energy range, with a multi-peaked structure. The burst position was reconstructed as:

RA(J2000): 189.011 deg (12h 36m 02.64s)

DEC(J2000): -46.796 deg (-46d 47' 45.58")

with an uncertainty of 5' (radius). The uncertainty accounts for both the statistical and systematic errors.

The SuperAGILE error box is completely contained in the FERMI-LAT error box (McEnery et al., GCN 20464) and partially intersects the IPN annulus (Hurley et al., GCN 20475). The Swift-XRT afterglow candidate (D'Avanzo et al., GNC 20477) is also contained in the SuperAGILE error box.

Due to telemetry downlink restrictions, the SuperAGILE experiment has been kept on but with no telemetry download since late 2012. The full telemetry link for the AGILE mission has now been restored and the data of SuperAGILE are again routinely downloaded.

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 20474
SUBJECT: GRB 170115B: AGILE detection
DATE: 17/01/16 22:48:39 GMT
FROM: Francesco Verrecchia at ASDC <francesco.verrecchia@asdc.asi.it>

F. Verrecchia (ASDC and INAF/OAR), A. Ursi (INAF/IAPS), F. Lucarelli (ASDC and INAF/OAR), F. Longo (Univ. Trieste and INFN Trieste), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata) report:

AGILE detected the long GRB 170115B, reported by Fermi-GBM (Hamburg et al. GCN #20463) and Fermi-LAT (McEnery et al. GCN #20464), at favourable off-axis angles between 0 and 30 deg. The AGILE-GRID detected the burst at about 4-sigma above 30 MeV with an extended gamma-ray emission lasting about 60 sec.

The AGILE MiniCaLorimeter (MCAL), sensitive in the energy range from 400 keV to 100 MeV, detected this burst that triggered the on-board sub-millisecond timescale logic. The MCAL light curve shows multiple peaks, from T0 until the end of the acquisition at T0 + 10.5 s. Three main peaks are evident during the first 2.5 sec following T0. During this time interval, the total number of counts is ~5500 for a background rate of 580 counts/s.

This measurement was obtained with AGILE observing a large portion of the sky in spinning mode.

TITLE: GCN CIRCULAR NUMBER: 16350
SUBJECT: IPN Triangulation of GRB 140604A (short/hard)
DATE: 14/06/05 15:27:42 GMT
FROM: Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>

S. Golenetskii, R. Aptekar, V. Pal'shin, D. Frederiks, D. Svinkin, and T. Cline on behalf of the Konus-Wind team, K. Hurley and J. Goldsten, on behalf of the MESSENGER NS GRB team, G. Di Cocco, F. Fuschino, M. Galli, C. Labanti, and M. Marisaldi, on behalf of the AGILE MCAL team, and A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report:

The short-duration, hard spectrum, bright GRB 140604A has been observed by Konus-Wind, AGILE (MCAL), MESSENGER (GRNS), and INTEGRAL (SPI-ACS), so far, at about 17411 s UT (04:50:11). We have triangulated it to a preliminary, 3 sigma error box whose coordinates are:

RA(2000), deg                     Dec (2000), deg

Center:

263.170 (17h 32m 41s)      -40.406 (-40d 24' 22")

Corners:

262.578 (17h 30m 19s)      -40.773 (-40d 46' 24")

263.162 (17h 32m 39s)      -41.034 (-41d 02' 02")

263.172 (17h 32m 41s)     v-39.770 (-39d 46' 12")

The error box area is 2020 sq. arcmin, and its maximum dimension is 76 arcmin (the minimum one is 31 arcmin). This box may be improved.

A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB140604_T17415/IPN/

The time history and spectrum will be given in a forthcoming GCN Circular.

TITLE: GCN CIRCULAR NUMBER: 16058
SUBJECT: GRB 140330A: intense and persistent gamma-ray emission detected by AGILE
DATE: 14/03/31 17:32:53 GMT
FROM: Carlotta Pittori at ASDC <carlotta.pittori@asdc.asi.it>

C. Pittori, F. Verrecchia (ASDC and INAF/OAR), A. Bulgarelli (INAF/IASF-Bo), A. Giuliani (INAF/IASF-Mi), M. Tavani (INAF/IAPS Rome, and Univ. Roma Tor Vergata), P. Caraveo(INAF/IASF-Mi), F. Lucarelli (ASDC and INAF/OAR), M. Marisaldi(INAF/IASF-Bo), F. Longo (Univ. of Trieste and INFN Trieste), E. Del Monte, F. Lazzarotto, I. Donnarumma, Y. Evangelista, M. Feroci, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IAPS Rome), G. Barbiellini, (INFN Trieste), F. Fuschino, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, V. Fioretti, M. Galli(INAF/IASF-Bo), S. Mereghetti, F. Perotti (INAF/IASF-Mi), M. Cardillo, E. Striani, (INAF/IAPS Rome, and Univ. Roma Tor Vergata), A. Argan, G. Piano, S. Sabatini, V. Vittorini (INAF/IAPS Rome), G. Pucella (ENEA Frascati), A. Pellizzoni, A. Trois (INAF/OA Cagliari), M. Pilia(ASTRON), S. Vercellone (INAF/IASF-Pa), P. W. Cattaneo, A. Rappoldi(INFN Pavia), A. Morselli, P. Picozza (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), A. Chen (Wits University), S.Colafrancesco (INAF/OAR and Wits University), P. Giommi, and G. Valentini (ASI), on behalf of the AGILE Team, report:

The AGILE Gamma Ray Imaging Detector (GRID) observed an intense and prolonged high-energy emission above 100 MeV from GRB 140330A(Fermi-LAT detection: G. Vianello et al., GCN 16048).

Despite a data telemetry gap of about 30 minutes occurring during the prompt emission of this GRB, a maximum likelihood analysis of the AGILE-GRID data integrated from 2014-03-30 04:50 UT (1805 s since trigger time) to 2014-03-31 08:00 UT yields a detection at a significance level larger than 4 sigma, with an average flux of F=(2.30 +/- 0.98) 10-6 ph/cm2/s (E > 100 MeV).

Due to the high fluence of this burst at E>100 MeV, comparable only to the one of GRB 130427A as recorded in the AGILE database, it was possible to derive its properties using the maximum likelihood techniques routinely used in the standard data analysis of AGILE-GRID point sources.

This measurement was obtained with AGILE observing a large portion of the sky in spinning mode.

TITLE: GCN CIRCULAR NUMBER: 15479
SUBJECT: GRB 131108A: AGILE/GRID observation
DATE: 13/11/09 21:41:41 GMT
FROM: Andrea Giuliani at IASF/INAF <giuliani@iasf-milano.inaf.it>

A. Giuliani (INAF/IASF-Mi), F. Longo (University of Trieste and INFN Trieste), F. Verrecchia, C. Pittori (ASDC and INAF/OAR), M. Marisaldi, F. Fuschino(INAF/IASF-Bo), F. Lucarelli (ASDC and INAF/OAR), E. Del Monte, F. Lazzarotto, I. Donnarumma, Y. Evangelista, M. Feroci, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IAPS Rome), G. Barbiellini, (INFN Trieste), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, V. Fioretti, M. Galli (INAF/IASF-Bo), A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF-Mi), M. Cardillo, E. Striani, M. Tavani (INAF/IAPS Rome, and Univ. Roma Tor Vergata), A. Argan, G. Piano, S. Sabatini, V. Vittorini (INAF/IAPS Rome), G. Pucella (ENEA Frascati), A. Pellizzoni, A. Trois (INAF/OA Cagliari), M. Pilia (ASTRON), S. Vercellone (INAF/IASF-Pa), P. W. Cattaneo, A. Rappoldi (INFN Pavia), A. Morselli, P. Picozza (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. Giommi (ASI), and G. Valentini (ASI), on behalf of the AGILE Team, report:

GRB 131108A (GCN 15464) transited in the field of view of AGILE approximately between t0-20 and t0+150 sec (with t0 = 08:41:55 UT).

A preliminary analysis of the Gamma-Ray Imaging Detector (GRID) data in temporal and spatial coincidence with the GRB shows a significant excess of gamma-ray events above 30 MeV at the location of the event.

During the first 80 seconds after t0 the GRID instrument detected 66 photons compatible with the GRB, most of which below 100 MeV, corresponding to a fluence of 2.56 +- 0.32 1e-5 erg / cm^2 in the energy band 30 MeV - 1 GeV.

The energy distribution of photons in the same energy band is compatible with a power-law of index -2.35 +-0.2 .

An analysis of the AGILE/MCAL data is also in progress. More observations of this interesting burst are strongly encouraged.

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 14823
SUBJECT: GRB 130606B: AGILE-MCAL observation
DATE: 13/06/08 07:52:59 GMT
FROM: Martino Marisaldi at INAF-IASF <marisaldi@iasfbo.inaf.it>

M. Marisaldi, F. Fuschino (INAF/IASF-Bo), F. Verrecchia, C. Pittori (ASDC and INAF/OAR), A. Giuliani (INAF/IASF-Mi), F. Longo (University of Trieste and INFN Trieste), F. Lucarelli (ASDC and INAF/OAR), E. Del Monte, F. Lazzarotto, I. Donnarumma, Y. Evangelista, M. Feroci, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IAPS Rome), G. Barbiellini, (INFN Trieste), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, V. Fioretti, M. Galli (INAF/IASF-Bo), A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF-Mi), M. Cardillo, E. Striani, M. Tavani (INAF/IAPS Rome, and Univ. Roma Tor Vergata), A. Argan, G. Piano, S. Sabatini, V. Vittorini (INAF/IAPS Rome), G. Pucella (ENEA Frascati), A. Pellizzoni, A. Trois (INAF/OA Cagliari), M. Pilia (ASTRON), S. Vercellone (INAF/IASF-Pa), P. W. Cattaneo, A. Rappoldi (INFN Pavia), A. Morselli, P. Picozza (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), S. Colafrancesco (INAF/OAR and WITS), P. Lipari, D. Zanello (INFN Roma-1), P. Giommi (ASI), and G. Valentini (ASI), on behalf of the AGILE Team, report:

"The long hard bright GRB 130606B, observed in gamma-rays by Fermi-LAT (Vianello et al., GCN 14795), Fermi-GBM (Yu et al., GCN 14801) and Konus-Wind (Golenetskii et al., GCN 14803), triggered AGILE-MCAL, sensitive in the range 0.4 - 100 MeV, at 11:55:33 UT (T0).

The light curve above 400 keV shows three main peaks between T0 and T0 + 20 s, followed by two less bright peaks at T0 + 40 s and T0 + 50 s.

The time-integrated spectrum measured between T0 and T0 + 20 s can be fit in the energy range 0.5 - 20 MeV with a simple power law with photon index -2.15 +/- 0.03 and reduced chi-squared 1.67 (46 d.o.f). As observed by MCAL the burst fluence in the same energy range and time interval is (1.62 +/- 0.05)E-04 erg/cm^2. All quoted errors are at 90% confidence levels.

The burst was 118 degrees off-axis with respect to the AGILE GRID pointing direction at T0, from a sky region not accessible to the GRID. This measurement was obtained with AGILE observing a large portion of the sky in spinning mode."

TITLE: GCN CIRCULAR NUMBER: 14344
SUBJECT: GRB 130327B: gamma-ray detection by AGILE
DATE: 13/03/27 23:24:56 GMT
FROM: Ettore Del Monte at IASF/INAF <sa.grb@iasf-roma.inaf.it>

F. Longo (University of Trieste and INFN Trieste), A. Giuliani (INAF/IASF Milan), M. Marisaldi (INAF/IASF Bologna), E. Del Monte (INAF/IAPS Rome), F. Lazzarotto, I. Donnarumma, Y. Evangelista, M. Feroci, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IAPS Rome), G. Barbiellini, (INFN Trieste), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Galli (INAF/IASF Bologna), A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), M. Tavani, V. Vittorini, A. Argan, G. Piano, S. Sabatini, M. Cardillo (INAF/IASF Rome), G. Pucella (ENEA Frascati), A. Pellizzoni, A. Trois (INAF/OA Cagliari), M. Pilia (ASTRON), S. Vercellone (INAF/IASF Palermo), P. W. Cattaneo, A. Rappoldi (INFN Pavia), P. Picozza, A. Morselli, E. Striani, (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. Giommi, C. Pittori, F. Lucarelli, P. Santolamazza, F. Verrecchia (ASDC) and G. Valentini (ASI), on behalf of the AGILE Team, report:

The AGILE Gamma Ray Imaging Detector (GRID) detected emission from GRB 130327B, localised by Fermi/GBM (http://gcn.gsfc.nasa.gov/other/386065447.fermi). The GRB occurred at approximately 28 deg off-axis in the field of view of the AGILE/GRID.

A preliminary analysis of the AGILE/GRID data in temporal coincidence with the GRB shows a significant excess of gamma-ray events above 80 MeV at the location of the event. Most of the events detected by the AGILE/GRID have times between ~ t0 + 9 sec and t0 + 14 sec where t0 is 27 March 2013 at 08:24:04.05 UT.

The GRB was also detected also by the AGILE/MCAL, operating in the energy range 0.5 - 100 MeV.

A more detailed analysis of the AGILE data is in progress. More observations of this interesting burst are strongly encouraged.

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 12666
SUBJECT: GRB 111211A: SuperAGILE localization of a long GRB
DATE: 11/12/12 07:34:30 GMT
FROM: Marco Feroci at IASF/INAF <sa.grb@iasf-roma.inaf.it>

F. Lazzarotto, E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Moretti (INFN Trieste), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli (INAF/IASF Bologna), A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), M. Tavani, G. Pucella, V. Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini, M. Cardillo (INAF/IASF Rome), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone, F. D'Ammando (INAF/IASF Palermo), P. W. Cattaneo, A. Rappoldi (INFN Pavia), P. Picozza, A. Morselli, E. Striani, (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. Giommi, C. Pittori, F. Lucarelli, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected a gamma ray burst on 11 December 2011, at 22:17:33 UT. The event had a duration of about 15 s in the 20-60 keV energy range, with a double peak (with internal structure). Assuming a crab-like energy spectrum, the peak flux on 1-s timescale was 1.50E-06 erg/cm2/s. The burst position was reconstructed as (RA, Dec) (153.091, 11.182) deg, which is:

RA(J2000) = 10h 12m 21.84s
Dec(J2000) = 11d 10' 55.52"

with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 12341
SUBJECT: GRB 110915B: SuperAGILE localization of a long GRB
DATE: 11/09/15 21:29:14 GMT
FROM: Marco Feroci at IASF/INAF <sa.grb@iasf-roma.inaf.it>

E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Moretti (INFN Trieste), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli (INAF/IASF Bologna), A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), M. Tavani, M. Cardillo, G. Pucella, V. Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone, F. D'Ammando (INAF/IASF Palermo), P. W. Cattaneo, A. Rappoldi (INFN Pavia), P. Picozza, A. Morselli, E. Striani, (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. Giommi, C. Pittori, F. Lucarelli, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected a gamma ray burst on 15 September 2011, at 18:24:19 UT. The event had a duration of about 18 s in the 20-60 keV energy range, with a single peak structure. Assuming a crab-like energy spectrum, the peak flux on 1-s timescale was 7.73E-08 erg/cm2/s. The burst position was reconstructed as (RA, Dec) (77.548, 1.925) deg, which is:

RA(J2000) = 05h 10m 11.57s
Dec(J2000) = 1d 55' 30.98"

with an uncertainty of 4' radius. The given uncertainty accounts for both the statistical and systematic errors.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 12274
SUBJECT: GRB 110812A: SuperAGILE localization of a long GRB
DATE: 11/08/12 07:38:41 GMT
FROM: Marco Feroci at IASF/INAF <sa.grb@iasf-roma.inaf.it>

E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Moretti (INFN Trieste), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli (INAF/IASF Bologna), A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), M. Tavani, G. Pucella, V. Vittorini, A. Argan, A. Trois, M. Cardillo, G. Piano, S. Sabatini (INAF/IASF Rome), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone, F. D'Ammando (INAF/IASF Palermo), P. W. Cattaneo, A. Rappoldi (INFN Pavia), P. Picozza, A. Morselli, E. Striani, (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. Giommi, C. Pittori, F. Lucarelli, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected a gamma ray burst on 12 August 2011, at 00:20:08 UT. The event had a duration of about 30 s in the 20-60 keV energy range, with a multi peak structure. Assuming a crab-like energy spectrum, the peak flux on 1-s timescale was 8.91E-08 erg/cm2/s. The burst position was reconstructed as (RA, Dec) (358.409, 72.206) deg, which is:

RA(J2000) = 23h 53m 38.15s
Dec(J2000) = 72d 12' 23.32"

with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 10996
SUBJECT: GRB 100724B: AGILE/GRID analysis
DATE: 10/07/26 16:21:05 GMT
FROM: Marco Feroci at IASF/INAF <sa.grb@iasf-roma.inaf.it>

A. Giuliani (INAF/IASF Milano), M. Tavani (INAF/IASF Roma), F. Longo (INFN Trieste), M. Marisaldi, F. Fuschino, C. Labanti, A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco (INAF/IASF Bologna), M. Galli (ENEA), E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda, A. Argan, G. Piano, G. Pucella, S. Sabatini, E. Striani, A. Trois, V. Vittorini (INAF/IASF Roma), A. Chen, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF Milano), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), F. D'Ammando, S. Vercellone (INAF/IASF Palermo), G. Barbiellini, E. Moretti, E. Vallazza (INFN Trieste), A. Morselli, P. Picozza (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P.W. Cattaneo, A. Rappoldi (INFN Pavia), S. Cutini, C. Pittori, F. Verrecchia, P. Santolamazza, F. Lucarelli and P. Giommi (ASDC), L. Salotti (ASI) report:

The Gamma-Ray Imaging Detector (GRID) on board AGILE detected the long bright GRB 100724B (Bhat, GCN 10977; Tanaka et al., GCN 10978; Golenetskii et al., GCN 10981, Marisaldi et al., GCN 10994) in the energy range 25 - 500 MeV with a statistical significance larger than 9 sigma.

The gamma-ray emission observed by the AGILE-GRID instrument lasted about 100 seconds, and two peaks are evident in the lightcurve consistent with the behaviour reported by Fermi LAT (the MCAL and GRID preliminary lightcurves are available at http://www.asdc.asi.it/images/GRB100724B_lc.gif ).

The total fluence above 25 MeV during this time interval is F = 0.2+/-0.1 ph/cm2 . A preliminary estimate of the gamma-ray spectral photon index is alpha= 2.2 +/-0.3.

GRB 100724B turns out to be the brightest GRB detected by AGILE above 100 MeV during its operations in space.

A plot showing the distance between the GRB position and the AGILE boresight as a function of time can be retrieved at http://www.asdc.asi.it/images/GRB_100724B_distance2.png .

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 10994
SUBJECT: GRB 100724B: gamma-ray detection by AGILE
DATE: 10/07/26 14:36:30 GMT
FROM: Martino Marisaldi at INAF-IASF <marisaldi@iasfbo.inaf.it>

M. Marisaldi, F. Fuschino, C. Labanti, M. Galli, A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco (INAF/IASF Bologna), E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Moretti (INFN Trieste), A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), M. Tavani, G. Pucella, V. Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone, F. D'Ammando (INAF/IASF Palermo), P. W. Cattaneo, A. Rappoldi (INFN Pavia), P. Picozza, A. Morselli, E. Striani, (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. Giommi, C. Pittori, F. Lucarelli, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"The AGILE Gamma-Ray Imaging Detector (GRID) and Mini-Calorimeter (MCAL) detected at gamma-ray energies the long bright GRB 100724B (Bhat, GCN 10977; Tanaka et al., GCN 10978; Golenetskii et al., GCN 10981).

The GRB triggered AGILE-MCAL, sensitive in the energy range 330 keV - 100 MeV, on 24 July 2010 at 00:42:00 UT (T0). As seen by MCAL the burst has a duration (T90) of ~96 s, with observable emission up to ~T0+150 s. The GRB emission has significant detection in MCAL up to an energy of about 80 MeV.

The time integrated spectrum in the time interval [T0, T0+150.0 s] can be fit in the energy range 500 keV - 80 MeV with a single powerlaw with photon index -2.09 (-0.06, +0.08) (reduced chi2 = 0.94 with 39 d.o.f.). The estimated fluence is (2.7 ± 0.2)x10-4 erg/cm2 in the same energy range. All reported errors are at the 90% confidence level.

AGILE-GRID shows a definite detection above 100 MeV. Further analysis are in progress.

This message may be cited."

TITLE: GCN CIRCULAR NUMBER: 10810
SUBJECT: GRB 100528A: SuperAGILE Localization of a Long GRB
DATE: 10/05/28 08:23:17 GMT
FROM: Marco Feroci at IASF/INAF <sa.grb@iasf-roma.inaf.it>

E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Moretti (INFN Trieste), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli (INAF/IASF Bologna), A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), M. Tavani, G. Pucella, V. Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone, F. D'Ammando (INAF/IASF Palermo), P. W. Cattaneo, A. Rappoldi (INFN Pavia), P. Picozza, A. Morselli, E. Striani, (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. Giommi, C. Pittori, F. Lucarelli, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected a gamma ray burst on 28 May 2010, at 01:48:05 UT. The event had a duration of about 20 s in the 20-60 keV energy range, with a single peak structure. Due to the AGILE spinning operative mode, the measured duration may be a lower limit. The burst position was reconstructed as (RA, Dec) (311.119, 27.810) deg, which is:

RA(J2000) = 20h 44m 28.52s
Dec(J2000) = 27d 48' 35.80"

with an uncertainty of 5' radius. The given uncertainty accounts for both the statistical and systematic errors.

AGILE MCAL reports significant detection above 1.4 MeV. An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 10560
SUBJECT: GRB 100331B: SuperAGILE Localization of a Long GRB
DATE: 10/04/01 09:04:47 GMT
FROM: Marco Feroci at IASF/INAF <sa.grb@iasf-roma.inaf.it>

E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone, F. D'Ammando (INAF/IASF Palermo), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli (INAF/IASF Bologna), M. Tavani, G. Pucella, V. Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Moretti (INFN Trieste), P. Picozza, A. Morselli, E. Striani, (INFN Roma-2), M. Prest, E. Vallazza (Universita' dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, F. Lucarelli, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected a gamma ray burst on 31 March 2010, at 21:08:38 UT. The event had a duration of about 30 s in the 20-60 keV energy range, with a multi-peak structure. AGILE is currently operating in a spinning mode and the reported duration may be a lower limit to the GRB duration.

The burst position was reconstructed as (RA, Dec)(302.987, -11.067) deg, which is:

RA(J2000) = 20h 11m 56.95s
Dec(J2000) = -11d 04' 02.04"

with an uncertainty of 6' radius to account for possible systematics error due to the spinning mode.

The GRB is not detected by the AGILE/MCAL (above 350 keV) nor AGILE/GRID (30 MeV - 30 GeV)."

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 10022
SUBJECT: GRB 091010: AGILE-MCAL measurement and GRID upper limit
DATE: 09/10/13 15:44:40 GMT
FROM: Martino Marisaldi at INAF-IASF <marisaldi@iasfbo.inaf.it>

M. Marisaldi, F. Fuschino (INAF/IASF Bologna), F. Longo, E. Moretti(INFN Trieste), A. Bulgarelli, F. Gianotti, M. Trifoglio, M. Galli, C. Labanti, G. Di Cocco (INAF/IASF Bologna), E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda, A. Argan, F. D'Ammando, G. Piano, G. Pucella, S. Sabatini, E. Striani, M. Tavani, A. Trois, V. Vittorini(INAF/IASF Roma), A. Chen, A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF Milano), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone (INAF/IASF Palermo), G. Barbiellini, E. Vallazza (INFN Trieste), A. Morselli, P. Picozza (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P.W. Cattaneo, A. Rappoldi (INFN Pavia), S. Cutini, P. Giommi, C. Pittori, P. Santolamazza, F. Verrecchia (ASDC), L. Salotti (ASI), report:

"The long GRB 091010 localized by SuperAGILE (Donnarumma et al., GCN 10004) triggered also the MCAL instrument onboard AGILE, sensitive in the energy range 330 keV - 100 MeV, at 02:43:10 UT (T0). As seen by MCAL the burst has a double-peaked light curve, with a duration of 3.5 s.The time integrated spectrum in the time interval [T0-1.5 s, T0+2.0 s] can be fit in the energy range 400 keV - 2 MeV with a single powerlaw with photon index -3.0 (-0.6, +0.8) (reduced chi2 = 1.09 with 9 d.o.f.). The estimated fluence is (1.40 +/- 0.3)x10-6 erg/cm2 in the same energy range. All reported errors are at the 90% confidence level. No significant emission is detected above 2 MeV.

The photon index and fluence are consistent with those reported by Konus-Wind (Golenetskii et al., GCN 10013), when the different energy range is accounted for.

No significant emission is detected by AGILE GRID. A 3-sigma Upper Limit for emission in the GRID energy range (E>30 MeV) in the same 3.5 seconds time interval used for MCAL analysis can be placed at 0.043 ph/cm2. Using a 60-seconds time interval starting from T0 the 3-sigma Upper Limit is 0.1 ph/cm2."

TITLE: GCN CIRCULAR NUMBER: 10004
SUBJECT: GRB 090910: SuperAGILE Localization of a Long GRB
DATE: 09/10/10 05:24:39 GMT
FROM: Marco Feroci at IASF/INAF <sa.grb@iasf-roma.inaf.it>

I. Donnarumma, Y. Evangelista, E. Del Monte, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone (INAF/IASF Palermo), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, E. Striani, V. Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Moretti (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected a long gamma ray burst on 10 October 2009, at 02:43:09 UT.

The event had a duration of about 10 s in the 17-60 keV energy range, with a highly structured shape. Assuming a Crab-like energy spectrum, the peak flux on 1-s timescale was about 6.2E-07 erg/cm2/s. The burst position was reconstructed as (RA, Dec) (298.669, -22.538) deg, which is: RA(J2000) = 19h 54m 40.51s Dec(J2000) = -22d 32' 17.36" with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors. An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

TITLE:   GCN CIRCULAR NUMBER:  9524
SUBJECT: GRB 090618: AGILE observations
DATE:    09/06/18 15:21:44 GMT
FROM:    Marco Feroci at IASF/INAF  <feroci@iasf-roma.inaf.it>

F. Longo, E. Moretti, G. Barbiellini, E. Vallazza (INFN Trieste), M.Trifoglio, A. Bulgarelli, F. Gianotti F. Fuschino, M. Marisaldi, C.Labanti, M.Galli, G.DiCocco (INAF/IASF Bologna), S. Cutini, C. Pittori (ASDC), M.Tavani, E.Striani, G. Pucella, F. D'Ammando, V.Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), E. Del Monte, M. Feroci, Y. Evangelista, I. Donnarumma, L. Pacciani, P. Soffitta, E. Costa, F.Lazzarotto, I. Lapshov, M. Rapisarda (INAF/IASF Rome) A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milano), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone (INAF/IASF Palermo), P. Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), A. Rappoldi, P. Cattaneo (INFN Pavia) and P. Giommi, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

The AGILE satellite detected GRB 090618 (P. Schady et al. GCN #9512) at about 36 degrees off axis.
 
Super-AGILE, operating in the 18-60 keV energy range, triggered and localized the burst in the 1-D region of the field of view at a position consistent with the Swift/BAT localization. The emission from this bright GRB with a complex lightcurve was detected at high significance despite the large off-axis direction.

AGILE-MCAL, operating in the 350 keV - 100 MeV energy range, triggered this GRB at 08:28:24.772 UT (T0).  The MCAL overall burst duration is about 100 sec. The burst is composed by three main pulses, the brightest starting at T0+62sec and lasting about 14 seconds.
The total MCAL spectrum between T0 and T0+120 sec can be fit by a simple powerlaw with photon index 3.16 (-0.30, +0.39) (90% c.l.), with reduced chi^2 0.99 (9 d.o.f.), in the 0.5-10 MeV energy range.
The estimated fluence is (3.2 +/- 0.6) 10^{-5} erg cm^-2 in the same energy range.

>From a preliminary analysis of the AGILE-GRID data in the energy range
30 MeV-30 GeV no significant gamma-ray emission above 30 MeV is detected in the GRB error box during both the first and second main pulse for a total duration of about 130 sec. A preliminary upper limit is 0.1 ph cm^-2 over a 130 s duration.

GRB 090618 provides a clear evidence for a class of GRBs bright below a few MeV, showing the lack of significant gamma-ray emission above 30 MeV.

TITLE:   GCN CIRCULAR NUMBER:  9343
SUBJECT: AGILE detection of GRB 090510
DATE:    09/05/10 19:38:52 GMT
FROM:    Marco Feroci at IASF/INAF  <sa.grb@iasf-roma.inaf.it>

F. Longo, E. Moretti, G. Barbiellini, E. Vallazza (INFN Trieste), A. Giuliani (INAF/IASF Milan), S. Cutini, C. Pittori (ASDC) M. Marisaldi, A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Galli (INAF/IASF Bologna), A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), Y. Evangelista, E. Del Monte, M. Feroci, I. Donnarumma, L. Pacciani, P. Soffitta, E. Costa, F. Lazzarotto, I. Lapshov, M. Rapisarda(INAF/IASF Rome), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone (INAF/IASF Palermo), M. Tavani, G. Pucella, F. D'Ammando, V.Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), P. Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), A. Rappoldi, P. Cattaneo (INFN Pavia) and P. Giommi, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

AGILE detected the remarkable short GRB 090510 (Hoversten et al. GCN #9331, Ohno et al. GCN #9334) at approximately 61 degrees off-axis.
An analysis of AGILE-GRID data shows an above 5-sigma detection of gamma-ray emission above 100 MeV. The gamma-ray lightcurve above 100 MeV shows emission during both the prompt phase and during a "delayed" phase.
Also the Mini-Calorimeter detected a very significant and structured event lasting ~200 msec with emission well above 3 MeV.
The burst triggered also SuperAGILE, although outside the field of view.
This is the first short GRB with emission above 100 MeV detected by AGILE.

TITLE: GCN CIRCULAR NUMBER: 9075
SUBJECT: GRB 090401B: AGILE refined analysis
DATE: 09/04/01 17:52:03 GMT
FROM: Sara Cutini at ASDC <sara.cutini@asdc.asi.it>

A.Giuliani (INAF/IASF Milan), S.Cutini, C. Pittori (ASDC) E. Moretti, F.Longo, G.Barbiellini, E.Vallazza (INFN Trieste), M. Marisaldi, A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Galli, (INAF/IASF Bologna), A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, L. Pacciani, P. Soffitta, E. Costa, F. Lazzarotto, I. Lapshov, M. Rapisarda(INAF/IASF Rome), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone (INAF/IASF Palermo), M. Tavani, G. Pucella, F. D'Ammando, V.Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), P. Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria), P.Lipari, D. Zanello (INFN Roma-1), A.Rappoldi, P.Cattaneo (INFN Pavia) and P. Giommi, P. Santolamazza, F.Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

A more refined analysis of the AGILE-GRID (Gamma-Ray Imaging Detector) data of GRB 090401B (Moretti et al. GCN 9069) confirms the gamma-ray detection of the GRB at energies above 30 MeV with a statistical significance larger than 4 for a 10-second integration after trigger.

Fluence estimate for a 10 second integration is 0.038+/-0.011 ph/cm2 (above 30 MeV). The GRB 090401B gamma-ray spectrum appears to be relatively hard.

An estimate of fluence in the 500 keV - 10 MeV range, as derived from MCAL data, is (1.6 +/- 0.5)e-5 erg/cm2 in the same time interval.

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 9069
SUBJECT: AGILE Gamma-ray detection of GRB 090401B
DATE: 09/04/01 13:17:12 GMT
FROM: Marco Feroci at IASF/INAF <feroci@iasf-roma.inaf.it>

E. Moretti, F. Longo, G. Barbiellini, E. Vallazza (INFN Trieste), A. Giuliani (INAF/IASF Milan), S. Cutini, C. Pittori (ASDC), A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, L. Pacciani, P. Soffitta, E. Costa, F. Lazzarotto, I. Lapshov, M. Rapisarda (INAF/IASF Rome), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone (INAF/IASF Palermo), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), P. Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), A.Rappoldi, P. Cattaneo (INFN Pavia) and P. Giommi, P. Santolamazza F.Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

The gamma ray burst 090401B (Schady et al. GCN 9066 & 9067) occurred in the field of view of AGILE, approximately 41 deg off-axis. This 12-s long event was triggered and localized in one dimension by SuperAGILE. It was detected also by the AGILE/ACS and MCAL, with significant detection above 2.8 MeV.

A preliminary analysis of the Gamma-Ray Imaging Detector (GRID) data in temporal and spatial coincidence with the GRB shows a significant excess of gamma-ray events above 30 MeV at the location of the event.

A more detailed analysis of the AGILE-GRID data is in progress. More observations of this interesting burst are strongly encouraged.

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 9029
SUBJECT: GRB 090324: SuperAGILE Localization of a Long GRB
DATE: 09/03/24 08:32:44 GMT
FROM: Marco Feroci at IASF/INAF <feroci@iasf-roma.inaf.it>

F. Lazzarotto, E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone (INAF/IASF Palermo), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Moretti (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected a gamma ray burst on 24 March 2009, at 02:48:09 UT. The event had a duration of about 30 s in the 20-60 keV energy range, with an overall FRED-like time structure. Assuming a crab-like energy spectrum, the peak flux on 1-s timescale was 1.8E-07 erg/cm2/s. The burst position was reconstructed as (RA, Dec) (257.178, -48.147) deg, which is:

RA(J2000) = 17h 08m 42.73s
Dec(J2000) = -48d 08' 47.59"

with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 9014
SUBJECT: A bright burst from AXP 1E 1547.0-5408/SGR J1550-5418
DATE: 09/03/23 02:25:59 GMT
FROM: Marco Feroci at IASF/INAF <feroci@iasf-roma.inaf.it>

E. Del Monte, Y. Evangelista, M. Feroci, I. Donnarumma, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), A. Giuliani, A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), A. Pellizzoni, M. Pilia (OA Cagliari), S. Vercellone (INAF/IASF Palermo), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Moretti (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"A bright burst from AXP 1E 1547.0-5408 / SGR J1550-5418 was triggered and imaged by SuperAGILE on 22 March 2009, at 22:39:16 UT. The event had a duration of about 250 ms, with a multi-peak structure. The peak flux on the 10 ms timescale was approximately 3.6e-5 erg/cm2/s in the 20-60 keV energy range, based on the raw assumption of a Crab-like energy spectrum. The latest reported bursting activity from this source dates back to 2009, Feb 24th (Kouveliotou et al., GCN #8915)."

TITLE: GCN CIRCULAR NUMBER: 8852
SUBJECT: GRB 090126: SuperAGILE Localization of a Long GRB
DATE: 09/01/26 08:35:37 GMT
FROM: Marco Feroci at IASF/INAF <feroci@iasf-roma.inaf.it>

Y. Evangelista, E. Del Monte, I. Donnarumma, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, P. Caraveo (INAF/IASF Milan), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), G. Barbiellini, F. Longo E. Moretti (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, B. Preger, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected a gamma ray burst on 26 January 2009, at 02:01:15 UT. The event had a duration of about 60 s in the 20-60 keV energy range, with a structure composed of two separated main peaks. Assuming a Crab-like energy spectrum, the peak flux on 1-s timescale was 1.5E-07 erg/cm2/s. The burst position was reconstructed as (RA, Dec) (3.848 deg, 81.365 deg), which is:

RA(J2000) = 00h 15m 23.50s
Dec(J2000) = 81d 21' 53.78"

with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 8817
SUBJECT: GRB 090117 - SuperAGILE Localization of a long GRB
DATE: 09/01/17 17:35:37 GMT
FROM: Marco Feroci at IASF/INAF <feroci@iasf-roma.inaf.it>

I. Donnarumma, E. Del Monte, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, P. Caraveo (INAF/IASF Milan), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois, G. Piano, S. Sabatini (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Moretti (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, B. Preger, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected a gamma ray burst on 17 January 2009, at 15:21:54 UT. The event had a duration of about 10.0 s in the 20-60 keV energy range, with a precursor followed by the main peak. Assuming a crab-like energy spectrum, the peak flux on 1-s timescale was about 2.7E-07 erg/cm2/s. The burst position was reconstructed as (RA, Dec) (164.003 deg, -58.249 deg), which is:

RA(J2000) = 10h 56m 00.75s
Dec(J2000) = -58d 14' 57.84"

with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 8305
SUBJECT: GRB081001: SuperAGILE Localization of a long GRB
DATE: 08/10/01 22:55:08 GMT
FROM: Marco Feroci at IASF/INAF <feroci@iasf-roma.inaf.it>

F. Lazzarotto, E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, P. Caraveo (INAF/IASF Milan), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, B. Preger, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected a gamma ray burst on 1st October 2008, at 21:17:42 UT. The event had a duration of about 40 s in the 20-60 keV energy range, with a first 10-s long bright peak, followed by a second broad peak about 20s apart. Assuming a Crab-like energy spectrum, the peak flux on 1-s timescale was about 6 ph/cm2/s or 5E-07 erg/cm2/s (20-60 keV). The burst position was reconstructed as (RA, Dec)

(276.576 deg, -8.754 deg), which is:

RA(J2000) = 18h 26m 18.34s
Dec(J2000) = -8d 45' 14.65"

with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors. An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress." This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 8151
SUBJECT: GRB 080828: SuperAGILE GRB Localization
DATE: 08/08/28 07:10:09 GMT
FROM: Marco Feroci at IASF/INAF <feroci@iasf-roma.inaf.it>

E. Del Monte, P. Soffitta, I. Donnarumma, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, P. Caraveo (INAF/IASF Milan), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, B. Preger, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected a gamma ray burst on 28 August 2008, at 03:14:45 UT. The event had a duration of about 25 s in the 20-60 keV energy range, with a single-peak structure. The burst position was reconstructed as (RA, Dec) (199.626 deg, -65.930 deg), which is:

RA(J2000) = 13h 18m 30.32s
Dec(J2000) = -65d 55' 48.2"

with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

This message may be cited.

TITLE: GCN CIRCULAR NUMBER: 8133
SUBJECT: GRB 080825B: GRB Localization by SuperAGILE
DATE: 08/08/25 20:11:07 GMT
FROM: Marco Feroci at IASF/INAF <feroci@iasf-roma.inaf.it>

Y. Evangelista, P. Soffitta, E. Del Monte, I. Donnarumma, M. Feroci, F. Lazzarotto, L. Pacciani, E. Costa, I. Lapshov, M. Rapisarda (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, P. Caraveo (INAF/IASF Milan), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, B. Preger, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected a gamma ray burst on 25 August 2008, at 17:46:40 UT. The event was approximately 10 degrees off-axis, with a duration of about 50 s in the 20-60 keV energy range, with a multi-peaked structure. The burst position was reconstructed as (RA, Dec) (209.281 deg, -68.943 deg), which is:

RA(J2000) = 13h 57m 07.42s
Dec(J2000) = -68d 56' 34.0"

with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

This message may be cited.

TITLE:   GCN CIRCULAR NUMBER:  8020
SUBJECT: GRB 080726: GRB Localization by SuperAGILE
DATE:    08/07/26 08:27:39 GMT
FROM:    Marco Feroci at IASF/INAF  <feroci@iasf-roma.inaf.it>

F. Lazzarotto, E. Del Monte, Y. Evangelista, M. Feroci, E. Costa, I. Donnarumma, I. Lapshov, L. Pacciani, M. Rapisarda, P. Soffitta, (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, P. Caraveo (INAF/IASF Milan), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and  P. Giommi, C. Pittori, B. Preger, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected a relatively weak gamma ray burst on July 26th 2008, at 01:26:10 UT. The event was approximately
25 degrees off-axis, with a duration of about 12s in the 20-60 keV energy range, with a single peak structure.
The event was detected during the ground processing, and unambigously localized in one of the two instrument coordinates, while in the other it showed a significance of about 4-sigma.
Based on this localization, the burst position was reconstructed as (RA, Dec) (20.398 deg, 13.913 deg), which is:

RA(J2000)  = 01h 21m 35.50s
Dec(J2000) = 13d 54' 46.6"

with an uncertainty of 5' radius. The given uncertainty accounts for both the statistical and systematic errors.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

This message may be cited.

TITLE:   GCN CIRCULAR NUMBER:8006
SUBJECT: GRB 080723B: AGILE GRID and MCAL results
DATE: 08/07/23 18:38:49 GMT
FROM: Sandro Mereghetti at IASF/CNR <sandro@iasf-milano.inaf.it>

F. Fornari, S. Mereghetti, A. Giuliani, S. Vercellone, A. Chen, A. Pellizzoni, F. Perotti, P. Caraveo (INAF/IASF Milan), M. Marisaldi, F. Fuschino, A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, M. Galli (INAF/IASF Bologna), E. Moretti, F. Longo, G. Barbiellini (INFN Trieste), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, E. Costa, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta (INAF/IASF Rome), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. Giommi, C. Pittori, B. Preger, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

Analysis of the AGILE Gamma Ray Imager Detector (GRID) data of the INTEGRAL GRB 080723B (Gotz et al. GCN 8002, Del Monte et al. GCN 8003) does not reveal significant high-energy emission during the time interval of the prompt emission.

A preliminary estimate of the fluence, integrated over 100 s, gives a 99% c.l. upper limit of 0.03 photons/cm^2 for energy greater than 50 MeV.

GRB 080723B has also triggered on-board the AGILE Mini-Calorimeter (MCAL) at 13:22:33 UT (=T0). Using the preliminary in-flight calibration and assuming a Crab-like spectrum we can estimate a fluence of (8 +/- 2)x10^-6 erg/cm^2 in the 350-700 keV energy range in the time interval between T0 and T0+48 s.

This message may be cited.

E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, E. Costa, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta, (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, P. Caraveo (INAF/IASF Milan), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, B. Preger, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected and localized a very bright gamma ray burst on July 23rd 2008, at 13:22:19 UT. The event was approximately 13 degrees off-axis. The observed duration in the 20-60 keV energy range is about 110 seconds, with a multi-peaked structure. The burst position was reconstructed as (RA, Dec) (176.823 deg, -60.262 deg), which is:

RA(J2000) = 11h 47m 17.42s

Dec(J2000) = -60d 15' 43.7"

with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors.

The same event was also localized and announced by INTEGRAL/ISGRI (BACODINE trigger n. 5311, and Gotz et al., GCN 8002).

The SuperAGILE position lies at 1.1 arcmin from the one reported in the INTEGRAL off-line analysis. A SuperAGILE light curve of the event will shortly be posted on the AGILE Science Data Center website: http://agile.asdc.asi.it .

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress." This message may be cited.

L. Pacciani, I. Donnarumma, E. Del Monte, M. Feroci, Y. Evangelista, E. Costa, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta, (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo, A. Zambra (INAF/IASF Milan), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected and localized a gamma ray burst on June 25th 2008, at 12:28:31 UT. The event was approximately 22 degrees off-axis. The observed duration in the 20-60 keV energy range is about 80 seconds, with a single peak structure. The burst was triggered and localized on ground. The burst position was reconstructed as (RA, Dec) (298.4423 deg, 56.2653 deg), which is:

RA(J2000) = 19h 53m 46.14s
Dec(J2000) = 56d 15' 55.1"

with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

This message may be cited.

M. Marisaldi, F. Fuschino, M. Galli, C. Labanti, A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco (INAF/IASF Bologna), E. Costa, E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta (INAF/IASF Roma), F. Fornari, A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, M. Fiorini, P. Caraveo (INAF/IASF Milano), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Vallazza (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"The Swift localized GRB 080607 (Mangano et al., GCN 7847; Stamatikos et al., GCN 7852) triggered the Mini-Calorimeter (MCAL) instrument onboard the AGILE satellite at 06:07:23 UT (=T0). The MCAL instrument covers the energy range 350 keV - 10 MeV, without imaging capabilities.

Using the preliminary in-flight calibration and assuming a Crab-like spectrum, we can estimate the fluence in the 350-700 keV energy band to be (23 +/- 7) photons/cm2 corresponding to (1.8 +/- 0.5)x10^-5 erg/cm2, in the time interval T0-T0+14 s. The 1-s peak flux measured at T0+5.1 s is (4.2 +/- 1.2) photons/cm2/s in the same energy band. The GRB was detected also in the 1.4-2.8 MeV energy band with a 10 sigma significance in the 256-ms time window.

We note that the quoted fluence is in agreement within errors with that obtained using the Konus-Wind spectrum reported in Golenetskii et al., GCN 7862. Assuming the spectral model reported in GCN 7862, an agreement in flux within 10% for the energy band 350-700 keV is obtained.

The Swift localization is at about 113 degrees off-axis with respect to the AGILE pointing, so well out of the field of view of the AGILE Gamma-Ray Imaging Detector (GRID), sensitive in the 50 MeV - 50 GeV energy range. Analysis of the GRID count rate does not show any detection.

This GRB triggered also SuperAGILE and was detected at about 17 sigma significance level in the 18-60 keV band, although it was well outside the field of view, and was detected through the collimator shielding."

This message may be cited.

K.L. Page, A.P. Beardmore (U. Leicester), S. Mereghetti (INAF - IASF Milano), M. Feroci and M. Tavani (INAF/IASF Roma) report on behalf of the Swift-XRT and AGILE teams:

Following a ToO request, Swift-XRT started observing the field of GRB 080514B at 20:12 on 14th May, about 37 ks after the trigger. Within the SuperAGILE/IPN error box, there are two sources detected, one of which is much brighter and appears to be fading. We therefore believe this to be the X-ray afterglow of the GRB.

Using 925 s of overlapping XRT Photon Counting mode and UVOT data, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 322.84426, 0.70843 which is equivalent to:

RA (J2000): 21 31 22.62
Dec (J2000): +00 42 30.3

with an uncertainty of 1.6 arcsec (radius, 90% confidence). This position is 1.7 arcsec from the i-filter object mentioned by de Ugarte Postigo et al., in GCN Circ. 7719.

A spectrum of the three orbits of Photon Counting (PC) mode data (6 ks of data, spanning 37-49 ks after the trigger) can be modelled with an absorbed power-law of Gamma = 2.06 +0.35/-0.31 and NH = (1.2 +0.8/-0.6)x10^21 cm^-2, which is slightly in excess of the Galactic value of 3.75x10^20 cm^-2. The observed (unabsorbed) 0.3-10 keV flux is 2.34x10^-12 (3.14x10^-12) erg cm^-2 s^-1. This corresponds to an observed counts to flux conversion of 1 count = 3.96x10^-11 erg cm^-2.

The light-curve can be fitted with a single power-law, with a slope of alpha = 1.5 +/- 1.0. If the light-curve continues to follow this decay, the count rate at 48 hours is predicted to be 6.6x10^-3 count s^-1 (an observed flux of 2.6x10^-13 erg cm^-2 s^-1).

This circular is an official product of the Swift-XRT team.

A. Giuliani, F. Fornari, S. Mereghetti, S. Vercellone, A. Chen, A. Pellizzoni, F. Perotti, M. Fiorini, P. Caraveo, A. Zambra (INAF/IASF Milan), P. Soffitta, I. Donnarumma, E. Del Monte, M. Feroci, Y. Evangelista, E. Costa, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda (INAF/IASF Rome), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), G. De Paris, P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"A quick look analysis of the AGILE GRID data of GRB 080514B (Rapisarda et al. GCN 7715) shows a possible detection at energies E>50 MeV at a position consistent with the SuperAGILE-IPN localization.

We have requested a ToO observation of the SuperAGILE-IPN error box with the Swift satellite. We encourage follow-up observations at other wavelengths."

This message may be cited.

M. Rapisarda, E. Costa, E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, I. Lapshov, F. Lazzarotto, L. Pacciani, P. Soffitta, (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo (INAF/IASF Milan), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), P. Cattaneo (INFN Pavia), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, B. Preger, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, K. Hurley, on behalf of the Mars Odyssey team, I. G. Mitrofanov, D. Golovin, M. L. Litvak, and A. B. Sanin, on behalf of the HEND-Odyssey GRB team, and W. Boynton, C. Fellows, K. Harshman, C. Shinohara and R. Starr, on behalf of the GRS-Odyssey GRB team, report:

"SuperAGILE and AGILE/MCAL detected a gamma ray burst on May 14th, at 09:55:56 UT. The event was localized by SuperAGILE at approximately 38 degrees off axis, in the one-dimensional portion of its field of view, thus providing a narrow and long error box. The narrow side is 6 arcmin wide, while the long side is approximately 40 degrees wide. In the 20-60 keV energy range the event had a 10s duration, with a multi-peaked structure.

The same event was also detected by Mars Odyssey. The IPN was thus able to reduce the SuperAGILE error box to the 100 sq arcmin error box whose corners are given by the following coordinates (RA, Dec):

322.962 (21h 31m 50.81s) 0.733 (0d 43m 59.69s)

322.774 (21h 31m 5.74s) 0.667 (0d 40m 2.78s)

322.867 (21h 31m 27.99s) 0.806 (0d 48m 21.16s)

322.678 (21h 30m 42.80s) 0.740 (0d 44m 23.63s)

The centroid of the error box is at (RA, Dec)= (322.820, 0.737) and the maximal distance between the box corners is 0.283 deg, that is 16.9 arcmin. The event occurred in the field of view of the AGILE GRID. A report on the AGILE/GRID data analysis will follow shortly. We urge follow-up observations at all wavelengths."

I. Lapshov, E. Costa, E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta, (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo (INAF/IASF Milan), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), P. Cattaneo (INFN Pavia), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and  P. Giommi, C. Pittori, B. Preger, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"SuperAGILE detected and localized a gamma ray burst on May 7th, at 07:45:00 UT. The event was detected during the passage of the AGILE spacecraft through the South Atlantic Anomaly and this caused the non-detection by the automatic burst search procedures, and the delayed identification thereof.
The observed duration in the 20-60 keV energy range is about 40 seconds, with a multi-peaked structure.
The burst position was reconstructed as (RA, Dec) (233.721 deg,
56.424 deg), which is:

RA(J2000) = 15h 34m 53.11s
Dec(J2000) = 56d 25' 27.3"

with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors.

This position lies approximately 100 arcsec from the galaxy NGC 5969.

The telemetry of the AGILE Gamma Ray Imager (GRID) is disabled during the passage through the South Atlantic Anomaly, thus no GRID data are available for this GRB."

S. Mereghetti, S. Vercellone, A. Giuliani, A. Chen, A. Pellizzoni, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo, A. Zambra (INAF/IASF Milan), P. Soffitta, I. Donnarumma, E. Del Monte, M. Feroci, Y. Evangelista, E. Costa, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda (INAF/IASF Rome), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, (ASDC) and L. Salotti (ASI), on bhealf of the AGILE Team, report:

A preliminary analysis of the AGILE GRID data (E>100 MeV) does not show any significant gamma ray emission at the time and coordinates of the burst GRB 080408 localized by SuperAGILE (GCN 7571).

This message may be cited.

TITLE:   GCN CIRCULAR NUMBER:  7571
SUBJECT: GRB 080408: GRB Localization by SuperAGILE
DATE:    08/04/08 20:56:13 GMT
FROM:    Marco Feroci at IASF/INAF  <feroci@iasf-roma.inaf.it>

P. Soffitta, I. Donnarumma, E. Del Monte, M. Feroci, Y. Evangelista, E. Costa, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo, A. Zambra (INAF/IASF Milan), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and  P. Giommi, C. Pittori, (ASDC) and L. Salotti (ASI), on bhealf of the AGILE Team, report:

"SuperAGILE detected and localized a gamma ray burst on April 8th, at 18:12:48 UT. The event was approximately
13 degrees off-axis. The observed duration in the 20-60 keV energy range is about 20 seconds, with a single pulse structure.
The burst was triggered and localized onboard, although distributed after verfication on ground. 
The burst position was reconstructed as (RA, Dec) (114.678 deg,
33.305 deg), which is:

RA(J2000) = 07h 38m 42.68s
Dec(J2000) = 33d 18' 16.7"

with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

This message may be cited.

M. Marisaldi (INAF/IASF Bologna), F. Fornari (INAF/IASF Milano), C. Labanti, F. Fuschino, M. Galli, A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco (INAF/IASF Bologna), E. Costa, E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta (INAF/IASF Roma), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, M. Fiorini, P. Caraveo (INAF/IASF Milano), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo, E. Vallazza (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report:

"The Swift localized GRB 080319C (Pagani et al., GCN 7442) triggered the
Mini-Calorimeter (MCAL) instrument onboard the AGILE satellite at 12:25:56 UT (=T0). The MCAL instrument covers the energy range 350 keV - 10 MeV, without imaging capabilities. The MCAL light curve shows two main overlapping broad peaks, the first peaking at T0 and the second peaking at T0+9s in the 350-700 keV energy band. Above 700 keV only the first peak is still detected, with 5 sigma detection also in the 1.4-2.8 MeV energy band. Using the preliminary
in-flight calibration, we can estimate the 1-s peak flux in the 350-700 keV energy band at T0 to be 2.0(-0.8,+0.9) photons/cm2/s. The Swift localization is out of the field of view of the AGILE Gamma-Ray Imaging Detector (GRID), sensitive in the 50 MeV - 50 GeV energy range.
Analysis of the GRID count rate does not show any detection. The event was well outside of the SuperAGILE field of view as well, but the event passed through the collimator shield and was weakly detected in the count rate." We incidentally note that the brighter GRB 080319B (Racusin et al. GCN 7427) was not observed by the AGILE instruments due to Earth occultation.
This message may be cited.

Y. Evangelista, E. Del Monte, M. Feroci, E. Costa, I. Donnarumma, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo, A. Zambra (INAF/IASF Milan), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, L. A. Antonelli (ASDC) and L. Salotti (ASI), on bhealf of the AGILE Team, report:

"SuperAGILE detected and localized a gamma ray burst on February 29th, at 23:33:01 UT. The event was approximately 13 degrees off-axis. The observed duration in the 20-60 keV energy range is above 100 seconds, with time structure. The burst was triggered and localized during on ground data processing. The burst position was reconstructed as (RA, Dec) (199.221 deg, -64.878 deg), which is:

RA(J2000) = 13h 16m 53.13s
Dec(J2000) = -64d 52' 40.8"

with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress."

This message may be cited.

I. Donnarumma, Y. Evangelista, M. Feroci, E. Costa, E. Del Monte, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo, A. Zambra (INAF/IASF Milan), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), F. Mauri (INFN Pavia) and P. Giommi, C. Pittori, L. A. Antonelli (ASDC) and L. Salotti (ASI), on bhealf of the AGILE Team, report:

"SuperAGILE detected and localized a gamma ray burst on November 4th, at 11:41:23 UT. The event was approximately 22 degrees off-axis. The observed duration in the 20-60 keV energy range is about 12 seconds, with a time structure composed of two main peaks. The burst was triggered and localized during on ground data processing, since the onboard localization procedure is not active yet. The burst position was reconstructed as (RA, Dec) (295.600 deg, 14.645 deg), which is:

RA(J2000) = 19h 42m 23.9s
Dec(J2000) = +14d 38' 42"

with an uncertainty of 8' radius. The given uncertainty accounts for both the statistical and systematic errors.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress. The Minicalorimeter also detected the event up to the energy range 0.7-1.4 MeV."

This message may be cited.

F.Perotti, A.Giuliani, S.Mereghetti, M.Fiorini, S.Vercellone, A.Chen, A.Pellizzoni (IASF-Milano), C.Labanti, M.Trifoglio, G.Di Cocco (IASF-Bologna), M.Tavani, M.Feroci, A.Argan, A.Trois (IASF-Roma), G.Picozza (INFN-Roma), F.Longo, G. Barbiellini (INFN-Trieste), on behalf of the AGILE Teamand P. Giommi, L.A. Antonelli, C. Pittori (ASDC), and L. Salotti (ASI) report:

"The SGR-like burst detected on July 27 at about 06:41 UT with Konus/Wind, INTEGRAL-SPI-ACS, RHESSI and Suzaku-WAM (Golenetskii et al. GCN 6684), and likely associated to SGR 1806-20, has been seen also by the Anticoincidence system of AGILE.

This segmented anticoincidence detector surrounds the gamma-ray tracker on five sides (top and 4 lateral). The relative intensity of the count rates measured from the different sides allows to estimate the arrival direction of the detected bursts.

Based on a simple geometrical model, the detection of this event in two of the lateral panels and its non-detection in the top panel, yields an instrumental azimuthal angle within 3 degrees from that of SGR 1806-20.

We thus support the association of this event with SGR 1806-20.

A.Chen, S.Vercellone, A.Giuliani, A.Pellizzoni, F.Fornari, S.Mereghetti, F.Perotti, M.Fiorini, P.Caraveo (IASF-Milano), C.Labanti, M.Marisaldi, F.Fuschino, M.Galli, A.Bulgarelli, F.Gianotti, M.Trifoglio, G.Di Cocco (IASF-Bologna), M.Tavani, G.Pucella, F.D'Ammando, E.Costa, M.Feroci, A.Trois, A.Argan (IASF-Roma), G.Picozza (INFN-Roma), F.Longo, G.Barbiellini (INFN-Trieste) on behalf of the AGILE Team and C. Pittori, P.Giommi, L.A.Antonelli (ASDC), and L. Salotti (ASI) report:

"Further analysis of the AGILE GRID (Gamma-Ray Imaging Detector) data of GRB 070724B (Feroci et al. GCN 6668) confirms the absence of significant emission at energy above 50 MeV. Only one photon consistent with the direction of GRB 070724B has been detected by the GRID in a ~100 second interval around the time of the burst. This is consistent with the measured background rate.

We note that a gamma-ray flux similar to that observed with EGRET from GRB930131 (Sommer et al.1994, ApJ 422, L66), would have given about 20 counts in the GRID in the same time interval.

We also analyzed the data of the AGILE Mini-Calorimeter, which provides a nearly whole-sky monitor in the energy range ~0.35-3 MeV (no directional information), without finding any statistically significant count rate increase in correspondence of GRB 070724B.

[GCN OPS NOTE(26jul06): Per author's reuqest, the Subject line was changed from "070734B" to "070724B".]

M. Feroci, E. Costa, E. Del Monte, I. Donnarumma, Y. Evangelista, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta, A. Rubini, E. Morelli, M. Mastropietro, G. Di Persio, M. Frutti, and S. Mereghetti, A. Pellizzoni, G. Di Cocco, C. Labanti, M. Trifoglio, G. Barbiellini, P. Picozza, A. Argan and M. Tavani, on behalf of the AGILE Team, P. Giommi, L.A. Antonelli, C. Pittori (ASDC), and L. Salotti (ASI) report:

"The SuperAGILE experiment onboard the AGILE mission, launched on April 23rd on an equatorial orbit, is currently performing the in-flight check-out and performance verification. The experiment is not yet in its optimal configuration and not all the functions are active. In particular, the onboard triggering and imaging is not active yet and the absolute position reconstruction is being calibrated by using celestial X-ray sources. During this testing phase SuperAGILE detected and imaged GRB 070724b. The event starting time is approximately at 23:25:09 UT on July 24 and it was observed at 21 degrees off-axis. The observed duration in the 20-60 keV energy range is about 55 seconds, with a multi-peak time structure.

The burst position was reconstructed as (RA, Dec) (17.629 deg, 57.673 deg), which is:

RA(J2000) = 01h 10m 31.0s
Dec(J2000) = +57d 40' 23"

with an uncertainty of 20' radius. The given uncertainty is almost entirely systematic and it is due to the very preliminary absolute position calibration, carried out only on 3 X-ray sources. At this preliminary stage the absolute positioning was obtained by the ground calibrations, preliminarily checked with these sources. The error box may be improved over the next hours/days.

An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress. A quick look analysis does not show any bright gamma-ray transient in coincidence with the X-ray emission of GRB 070724b.