The AGILE satellite detected the long GRB 220308A at T0 = 2022-03-08 05:43:08 (UTC), reported by INTEGRAL/SPI-ACS (trig#9761), Fermi/GBM (trigger no.668410535), CALET (GCN #31719), Konus-Wind (GCN #31723), Swift/BAT (GCN #31716), and triangulated by IPN (GCN #31715). 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 22 s and it released a total number of 2675 counts in the SA detector (above a background rate of 140 Hz), 54840 counts in the MCAL detector (above a background rate of 1300 Hz), and 104080 counts in the AC detector (above a background rate of 3680 Hz). The AGILE ratemeter light curves can be found at https://tools.ssdc.asi.it/ImgView/Agile/GRB220308A_AGILE_RM29 . The event also triggered a partial high time resolution MCAL data acquisition, covering the main peaks of the burst, from T1 = 2022-03-08 05:43:08.21 s +/- 0.01 (UTC) to T2 = 2022-03-08 05:43:15.06 +/- 0.01 s (UTC), and released 16490 counts in the detector, above a background rate of 640 Hz. The time-integrated spectrum of the burst in this time interval can be fitted in the energy range 0.4-10 MeV with a Band function with alpha = -0.70 (frozen), beta = -2.45 (-0.11/+0.09), and Epeak = 760 (-98/+97) keV, resulting in a reduced chi-squared of 1.32 (47 d.o.f.) and a fluence of 1.4e-04 ergs/cm^2 (90% confidence level), in the same energy range. The MCAL light curve can be found at: https://tools.ssdc.asi.it/ImgView/Agile/077313_GRB_57380300810779330 . 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 #573803008 the T0 was affected by a temporal shift of about +19.5 sec due to episodic automated ground software problems which are then corrected offline....
GRB 220308A: AGILE detection / Ursi, A.; di Piano, A.; Verrecchia, F.; Pittori, C.; Tavani, M.; Argan, A.; Cardillo, M.; Casentini, C.; Evangelista, Y.; Menegoni, E.; Foffano, L.; Piano, G.; Lucarelli, F.; Bulgarelli, A.; Fioretti, V.; Fuschino, F.; Parmiggiani, N.; Marisaldi, M.; Pilia, M.; Trois, A.; Donnarumma, I.; Longo, F.; Giuliani, A.; Agile, Team. - (2022).
GRB 220308A: AGILE detection
di Piano, A.;
2022
Abstract
The AGILE satellite detected the long GRB 220308A at T0 = 2022-03-08 05:43:08 (UTC), reported by INTEGRAL/SPI-ACS (trig#9761), Fermi/GBM (trigger no.668410535), CALET (GCN #31719), Konus-Wind (GCN #31723), Swift/BAT (GCN #31716), and triangulated by IPN (GCN #31715). 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 22 s and it released a total number of 2675 counts in the SA detector (above a background rate of 140 Hz), 54840 counts in the MCAL detector (above a background rate of 1300 Hz), and 104080 counts in the AC detector (above a background rate of 3680 Hz). The AGILE ratemeter light curves can be found at https://tools.ssdc.asi.it/ImgView/Agile/GRB220308A_AGILE_RM29 . The event also triggered a partial high time resolution MCAL data acquisition, covering the main peaks of the burst, from T1 = 2022-03-08 05:43:08.21 s +/- 0.01 (UTC) to T2 = 2022-03-08 05:43:15.06 +/- 0.01 s (UTC), and released 16490 counts in the detector, above a background rate of 640 Hz. The time-integrated spectrum of the burst in this time interval can be fitted in the energy range 0.4-10 MeV with a Band function with alpha = -0.70 (frozen), beta = -2.45 (-0.11/+0.09), and Epeak = 760 (-98/+97) keV, resulting in a reduced chi-squared of 1.32 (47 d.o.f.) and a fluence of 1.4e-04 ergs/cm^2 (90% confidence level), in the same energy range. The MCAL light curve can be found at: https://tools.ssdc.asi.it/ImgView/Agile/077313_GRB_57380300810779330 . 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 #573803008 the T0 was affected by a temporal shift of about +19.5 sec due to episodic automated ground software problems which are then corrected offline....
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