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GCN Circular 31270

Subject
GRB 211219A: AGILE detection
Date
2021-12-20T17:27:59Z (2 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia (SSDC, and
INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M.
Cardillo, C. Casentini, Y. Evangelista, L. Foffano, E. Menegoni, G. Piano
(INAF/IAPS), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani
(INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University),
M. Pilia, A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ.
Trieste and INFN Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of
the AGILE Team:

The AGILE satellite detected the long GRB 211219A at T0 = 2021-12-19
14:55:22 (UTC), reported by Fermi GBM (GCN #31265).

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 6.0 s and it released a total number of
7115 counts in the MCAL detector (above a background rate of 1240 Hz), and
18620 counts in the AC detector (above a background rate of 3450 Hz). The
AGILE ratemeter light curves can be found at
http://www.agilescienceapp.it/notices/GRB211219A_AGILE_RM.png . At the T0,
the event was about 63�� 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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