The AGILE satellite detected the long GRB 220210A at T0 = 2022-02-10 23:56:38.40 +/- 0.01 s (UTC), reported by Fermi GBM (GCN #31568) and Swift BAT (GCN #31572). The burst is clearly visible in the AGILE scientific ratemeters of the MiniCALorimeter (MCAL; 0.4-100 MeV) and AntiCoincidence (AC; 50-200 keV) detectors. The event lasted about 1.9 s (in the 0.4-100 MeV energy range) and it released a total number of 2110 counts in the MCAL detector (above a background rate of 1230 Hz), and 3910 counts in the AC detector (above a background rate of 3330 Hz). The AGILE ratemeters light curves can be found at http://www.agilescienceapp.it/notices/GRB220210A_AGILE_RM.png . The event also triggered a high time resolution MCAL data acquisition, which released 1440 counts in the detector, above a background rate of 505 Hz. The time-integrated spectrum of the burst, from T0-0.19 s to T0+1.73 s, can be fitted in the energy range 0.4-5 MeV with a power-law with ph.ind. = -1.81 (-0.19,+0.21), resulting in a reduced chi-squared of 1.18 (36 d.o.f.) and a fluence of 3.40e-06 erg/cm^2 (90% confidence level), in the same energy range. The MCAL light curve can be found at http://www.agilescienceapp.it/notices/076950_GRB_571622198.404213.png . At the T0, the event was 15 deg off-axis. 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 220210A: AGILE detection / Ursi, A.; Foffano, L.; Verrecchia, F.; Pittori, C.; Tavani, M.; Argan, A.; Cardillo, M.; Casentini, C.; Evangelista, Y.; Menegoni, E.; Piano, G.; Lucarelli, F.; Bulgarelli, A.; di Piano, A.; Fioretti, V.; Fuschino, F.; Parmiggiani, N.; Marisaldi, M.; Pilia, M.; Trois, A.; Donnarumma, I.; Giuliani, A.; Longo, F.; Tempesta, P.; Agile, Team. - (2022).
GRB 220210A: AGILE detection
di Piano, A.;
2022
Abstract
The AGILE satellite detected the long GRB 220210A at T0 = 2022-02-10 23:56:38.40 +/- 0.01 s (UTC), reported by Fermi GBM (GCN #31568) and Swift BAT (GCN #31572). The burst is clearly visible in the AGILE scientific ratemeters of the MiniCALorimeter (MCAL; 0.4-100 MeV) and AntiCoincidence (AC; 50-200 keV) detectors. The event lasted about 1.9 s (in the 0.4-100 MeV energy range) and it released a total number of 2110 counts in the MCAL detector (above a background rate of 1230 Hz), and 3910 counts in the AC detector (above a background rate of 3330 Hz). The AGILE ratemeters light curves can be found at http://www.agilescienceapp.it/notices/GRB220210A_AGILE_RM.png . The event also triggered a high time resolution MCAL data acquisition, which released 1440 counts in the detector, above a background rate of 505 Hz. The time-integrated spectrum of the burst, from T0-0.19 s to T0+1.73 s, can be fitted in the energy range 0.4-5 MeV with a power-law with ph.ind. = -1.81 (-0.19,+0.21), resulting in a reduced chi-squared of 1.18 (36 d.o.f.) and a fluence of 3.40e-06 erg/cm^2 (90% confidence level), in the same energy range. The MCAL light curve can be found at http://www.agilescienceapp.it/notices/076950_GRB_571622198.404213.png . At the T0, the event was 15 deg off-axis. 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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