The AGILE MiniCALorimeter (MCAL; 0.4-100 MeV) detected the short GRB 220323A at T0 = 2022-03-23 12:10:11 (UTC), reported by Fermi GBM (GCN #31782). The event lasted 0.35 s and released 295 counts in the detector, above a background rate of 630 Hz. The time-integrated spectrum of the burst can be fitted in the energy range 0.4-2 MeV with a power-law with ph.ind = 2.44 (-0.70/+1.13), resulting in a reduced chi-squared of 1.06 (21 d.o.f.) and a fluence of 5.6e-07 erg/cm^2 (90% confidence level), in the same energy range. The MCAL light curve can be found at http://www.agilescienceapp.it/notices/077531_GRB_575122215.552228.png . At the T0, the event was 134 deg off-axis. The burst is also clearly visible in the AGILE scientific ratemeters of the MCAL detector, where it released a total number of 1550 counts (above a background rate of 1230 Hz). The AGILE MCAL ratemeters light curve can be found at http://www.agilescienceapp.it/notices/GRB220323A_AGILE_RM.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 #575122215 the T0 was affected by a temporal shift of about +4.0 sec due to episodic automated ground software problems which are then corrected offline....
GRB 220323A: AGILE/MCAL detection / Ursi, A.; Romani, M.; Pittori, C.; Verrecchia, F.; Tavani, M.; Argan, A.; Cardillo, M.; Casentini, C.; Evangelista, Y.; Foffano, L.; 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 220323A: AGILE/MCAL detection
di Piano, A.;
2022
Abstract
The AGILE MiniCALorimeter (MCAL; 0.4-100 MeV) detected the short GRB 220323A at T0 = 2022-03-23 12:10:11 (UTC), reported by Fermi GBM (GCN #31782). The event lasted 0.35 s and released 295 counts in the detector, above a background rate of 630 Hz. The time-integrated spectrum of the burst can be fitted in the energy range 0.4-2 MeV with a power-law with ph.ind = 2.44 (-0.70/+1.13), resulting in a reduced chi-squared of 1.06 (21 d.o.f.) and a fluence of 5.6e-07 erg/cm^2 (90% confidence level), in the same energy range. The MCAL light curve can be found at http://www.agilescienceapp.it/notices/077531_GRB_575122215.552228.png . At the T0, the event was 134 deg off-axis. The burst is also clearly visible in the AGILE scientific ratemeters of the MCAL detector, where it released a total number of 1550 counts (above a background rate of 1230 Hz). The AGILE MCAL ratemeters light curve can be found at http://www.agilescienceapp.it/notices/GRB220323A_AGILE_RM.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 #575122215 the T0 was affected by a temporal shift of about +4.0 sec due to episodic automated ground software problems which are then corrected offline....
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