The AGILE satellite detected the GRB 211120A at T0 = 2021-11-20 23:05:20 (UTC), reported by GECAM (GCN #31100) and AstroSat CZTI (GCN #31104). The burst is clearly visible in the AGILE scientific ratemeters of the SuperAGILE (SA; 20-60 keV), MiniCALorimeter (MCAL; 0.4-100 MeV), and AntiCoincidence (AC; 50-200 keV) detectors. The event lasted about 6 s and it released a total number of 821 counts in the SA detector (above a background rate of 96 Hz), 9275 counts in the MCAL detector (above a background rate of 1210 Hz), and 23969 counts in the AC detector (above a background rate of 3440 Hz). The AGILE ratemeter light curves can be found at http://www.agilescienceapp.it/notices/GRB211120A_AGILE_RM.png . The event also triggered a partial high time resolution MCAL data acquisition, covering the main peak of the burst, from T1 = 2021-11-20 23:05:20.0 s +/- 0.5 (UTC) to T2 = 2021-11-20 23:05:26.0 +/- 0.5 s (UTC), and released 2291 counts in the detector, above a background rate of 710 Hz. The time-integrated spectrum of the burst between T1 and T1+2.43 s can be fitted in the energy range 0.4-20 MeV with a single power-law with ph. ind. = -2.43 (-0.34/+0.44), resulting in a reduced chi-squared of 1.09 (62 d.o.f.) and a fluence of 5.9e-06 ergs/cm^2 (90% confidence level), in the same energy range. The MCAL light curve can be found at: http://www.agilescienceapp.it/notices/GRB211120A_MCAL.png . Additional analysis of AGILE data is in progress. Automatic MCAL GRB alert Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html. Please note that in the MCAL notice #564534599 the T0 was affected by a temporal shift of about +279 sec due to a temporary ground software problem now solved....
GRB 211120A: AGILE detection / Ursi, A.; Pittori, C.; Trois, A.; Tavani, M.; Argan, A.; Cardillo, M.; Casentini, C.; Evangelista, Y.; Menegoni, E.; Foffano, L.; Piano, G.; Lucarelli, F.; Verrecchia, F.; Bulgarelli, A.; di Piano, A.; Fioretti, V.; Fuschino, F.; Parmiggiani, N.; Marisaldi, M.; Pilia, M.; Donnarumma, I.; Longo, F.; Giuliani, A.; Agile, Team. - (2021).
GRB 211120A: AGILE detection
di Piano, A.;
2021
Abstract
The AGILE satellite detected the GRB 211120A at T0 = 2021-11-20 23:05:20 (UTC), reported by GECAM (GCN #31100) and AstroSat CZTI (GCN #31104). The burst is clearly visible in the AGILE scientific ratemeters of the SuperAGILE (SA; 20-60 keV), MiniCALorimeter (MCAL; 0.4-100 MeV), and AntiCoincidence (AC; 50-200 keV) detectors. The event lasted about 6 s and it released a total number of 821 counts in the SA detector (above a background rate of 96 Hz), 9275 counts in the MCAL detector (above a background rate of 1210 Hz), and 23969 counts in the AC detector (above a background rate of 3440 Hz). The AGILE ratemeter light curves can be found at http://www.agilescienceapp.it/notices/GRB211120A_AGILE_RM.png . The event also triggered a partial high time resolution MCAL data acquisition, covering the main peak of the burst, from T1 = 2021-11-20 23:05:20.0 s +/- 0.5 (UTC) to T2 = 2021-11-20 23:05:26.0 +/- 0.5 s (UTC), and released 2291 counts in the detector, above a background rate of 710 Hz. The time-integrated spectrum of the burst between T1 and T1+2.43 s can be fitted in the energy range 0.4-20 MeV with a single power-law with ph. ind. = -2.43 (-0.34/+0.44), resulting in a reduced chi-squared of 1.09 (62 d.o.f.) and a fluence of 5.9e-06 ergs/cm^2 (90% confidence level), in the same energy range. The MCAL light curve can be found at: http://www.agilescienceapp.it/notices/GRB211120A_MCAL.png . Additional analysis of AGILE data is in progress. Automatic MCAL GRB alert Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html. Please note that in the MCAL notice #564534599 the T0 was affected by a temporal shift of about +279 sec due to a temporary ground software problem now solved....
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