The AGILE satellite detected the long GRB 220101A at T0 = 2022-01-01 05:11:22 (UTC), reported by Swift BAT (GCN #31347, #31348), Swift XRT (GCN #31349), Swift UVOT (GCN #31351), and Fermi LAT (GCN #31350). 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 80 s and it released a total number of 14577 counts in the SA detector (above a background rate of 100 Hz), 95830 counts in the MCAL detector (above a background rate of 1140 Hz), and 256390 counts in the AC detector (above a background rate of 3215 Hz). The AGILE ratemeters light curves can be found at http://www.agilescienceapp.it/notices/GRB220101A_AGILE_RM.png . The event also triggered a partial high time resolution MCAL data acquisition, from T1 = 2022-01-01 05:11:21.50 +/- 0.01 s (UTC) to T2 = 2022-01-01 05:11:55.74 +/- 0.01 s (UTC), and released 10934 counts in the detector, above a background rate of 570 Hz. The time-integrated spectrum of the burst in this time interval can be fitted in the energy range 0.4-100 MeV with a power-law with ph. ind. = -1.28 (-0.11/+0.11), resulting in a reduced chi-squared of 0.96 (84 d.o.f.) and a fluence of 7.8e-05 ergs/cm^2 (90% confidence level), in the same energy range. We divided the data acquisition into four time intervals: interval a [T0-0.5 s, T0+10.0 s], interval b [T0+10.0 s, T0+17.0 s], interval c [T0+17.0 s, T0+24.0 s], and interval d [T0+24.0 s, T0+34.0 s]. The spectral analysis in the energy range 0.4-100 MeV shows an evolution of the power law photon index in the first stages of the burst, passing from -0.98 to -1.70. Details are reported below: | model | ph. ind. | red chi^2 (dof) | fluence (erg/cm^2) a | PL | 0.98 (-0.29/+0.19) | 1.00 (75) | (1.8+/-0.2)e-5 b | PL | 0.93 (-0.40/+0.22) | 0.98 (75) | (8.3+/-0.8)e-6 c | PL | 1.31 (-0.22/+0.23) | 0.99 (75) | (1.1+/-0.1)e-5 d | PL | 1.70 (-0.13/+0.29) | 1.05 (75) | (2.6+/-0.3)e-5 The MCAL light curve can be found at: http://www.agilescienceapp.it/notices/GRB220101A_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 220101A: AGILE detection / Ursi, A.; Menegoni, E.; Longo, F.; Pittori, C.; Verrecchia, F.; Tempesta, P.; Tavani, M.; Argan, A.; Cardillo, M.; Casentini, C.; Evangelista, Y.; 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.; Giuliani, A.; Agile, Team. - (2022).
GRB 220101A: AGILE detection
di Piano, A.;
2022
Abstract
The AGILE satellite detected the long GRB 220101A at T0 = 2022-01-01 05:11:22 (UTC), reported by Swift BAT (GCN #31347, #31348), Swift XRT (GCN #31349), Swift UVOT (GCN #31351), and Fermi LAT (GCN #31350). 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 80 s and it released a total number of 14577 counts in the SA detector (above a background rate of 100 Hz), 95830 counts in the MCAL detector (above a background rate of 1140 Hz), and 256390 counts in the AC detector (above a background rate of 3215 Hz). The AGILE ratemeters light curves can be found at http://www.agilescienceapp.it/notices/GRB220101A_AGILE_RM.png . The event also triggered a partial high time resolution MCAL data acquisition, from T1 = 2022-01-01 05:11:21.50 +/- 0.01 s (UTC) to T2 = 2022-01-01 05:11:55.74 +/- 0.01 s (UTC), and released 10934 counts in the detector, above a background rate of 570 Hz. The time-integrated spectrum of the burst in this time interval can be fitted in the energy range 0.4-100 MeV with a power-law with ph. ind. = -1.28 (-0.11/+0.11), resulting in a reduced chi-squared of 0.96 (84 d.o.f.) and a fluence of 7.8e-05 ergs/cm^2 (90% confidence level), in the same energy range. We divided the data acquisition into four time intervals: interval a [T0-0.5 s, T0+10.0 s], interval b [T0+10.0 s, T0+17.0 s], interval c [T0+17.0 s, T0+24.0 s], and interval d [T0+24.0 s, T0+34.0 s]. The spectral analysis in the energy range 0.4-100 MeV shows an evolution of the power law photon index in the first stages of the burst, passing from -0.98 to -1.70. Details are reported below: | model | ph. ind. | red chi^2 (dof) | fluence (erg/cm^2) a | PL | 0.98 (-0.29/+0.19) | 1.00 (75) | (1.8+/-0.2)e-5 b | PL | 0.93 (-0.40/+0.22) | 0.98 (75) | (8.3+/-0.8)e-6 c | PL | 1.31 (-0.22/+0.23) | 0.99 (75) | (1.1+/-0.1)e-5 d | PL | 1.70 (-0.13/+0.29) | 1.05 (75) | (2.6+/-0.3)e-5 The MCAL light curve can be found at: http://www.agilescienceapp.it/notices/GRB220101A_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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