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GCN Circular 33113

Subject
GRB 221226A: AGILE detection
Date
2022-12-27T13:57:53Z (a year ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
G. Panebianco (Univ. Bologna - INAF/OAS-Bologna), A. Ursi (INAF/IAPS), C.
Pittori (SSDC, and INAF/OAR), C. Casentini (INAF/IAPS),  A. Bulgarelli
(INAF/OAS-Bologna), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A.
Argan, M. Cardillo, Y. Evangelista, L. Foffano, E. Menegoni, G. Piano
(INAF/IAPS), A. Addis, L. Baroncelli, A. Di Piano, V. Fioretti, N.
Parmiggiani (INAF/OAS-Bologna), F. Lucarelli, F. Verrecchia (SSDC, and
INAF/OAR), M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OASBologna, and
Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari), F. Longo (Univ.
Trieste and INFN Trieste), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi),
and P. Tempesta (TeleSpazio), report on behalf of the AGILE Team:

The AGILE satellite detected the GRB 221226A at T0 = 2022-12-26 16:44:27 s
(UTC), reported by Fermi GBM (GCN #33104). The burst is 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 18 s and
it released a total number of 26728 counts in the MCAL detector (above a
background rate of 1222 Hz), and 68254 counts in the AC detector (above a
background rate of 3101 Hz). The AGILE ratemeters light curves can be found
at http://www.agilescienceapp.it/notices/GRB221226A_AGILE_RM_ND.png .
At the T0, the event was 78.3 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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