The AGILE satellite detected the long GRB 211229B at T0 = 2021-12-29 22:18:43 (UTC), reported by Fermi GBM (GCN #31336) and GECAM (GCN #31339). 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 40 s and it released a total number of 5440 counts in the SA detector (above a background rate of 120 Hz), 48230 counts in the MCAL detector (above a background rate of 1170 Hz), and 141030 counts in the AC detector (above a background rate of 3440 Hz). The AGILE ratemeters light curves can be found at http://www.agilescienceapp.it/notices/GRB211229B_AGILE_RM.png . The event also triggered a partial high time resolution MCAL data acquisition, covering the main peak of the burst, from T1 = 2021-12-29 22:18:45.12 s +/- 0.01 (UTC) to T2 = 2021-12-29 22:18:48.83 +/- 0.01 s (UTC), and released 2354 counts in the detector, above a background rate of 620 Hz. The time-integrated spectrum of the burst in this time interval can be fitted in the energy range 0.4-20 MeV with a power-law with ph. ind. = -2.45 (-0.82/+1.53), resulting in a reduced chi-squared of 1.40 (34 d.o.f.) and a fluence of 1.8e-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/GRB211229B_AGILE_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....
GRB 211229B: AGILE detection / Ursi, A.; Pittori, C.; Verrecchia, F.; Tavani, M.; Argan, A.; Cardillo, M.; Casentini, C.; Evangelista, Y.; Menegoni, E.; Foffano, L.; Piano, G.; Lucarelli, F.; Bulgarelli, A.; di Piano, A.; Fioretti, V.; Fuschino, F.; Parmiggiani, N.; Marisaldi, M.; Pilia, M.; Trois, A.; Donnarumma, I.; Longo, F.; Giuliani, A.; Agile, Team. - (2021).
GRB 211229B: AGILE detection
di Piano, A.;
2021
Abstract
The AGILE satellite detected the long GRB 211229B at T0 = 2021-12-29 22:18:43 (UTC), reported by Fermi GBM (GCN #31336) and GECAM (GCN #31339). 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 40 s and it released a total number of 5440 counts in the SA detector (above a background rate of 120 Hz), 48230 counts in the MCAL detector (above a background rate of 1170 Hz), and 141030 counts in the AC detector (above a background rate of 3440 Hz). The AGILE ratemeters light curves can be found at http://www.agilescienceapp.it/notices/GRB211229B_AGILE_RM.png . The event also triggered a partial high time resolution MCAL data acquisition, covering the main peak of the burst, from T1 = 2021-12-29 22:18:45.12 s +/- 0.01 (UTC) to T2 = 2021-12-29 22:18:48.83 +/- 0.01 s (UTC), and released 2354 counts in the detector, above a background rate of 620 Hz. The time-integrated spectrum of the burst in this time interval can be fitted in the energy range 0.4-20 MeV with a power-law with ph. ind. = -2.45 (-0.82/+1.53), resulting in a reduced chi-squared of 1.40 (34 d.o.f.) and a fluence of 1.8e-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/GRB211229B_AGILE_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....
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