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GCN Circular 33093

GRB 221221A: AGILE detection
2022-12-22T15:24:54Z (a year ago)
Claudio Casentini at INAF-IAPS <>
C. Casentini (INAF/IAPS), F. Lucarelli, C. Pittori (SSDC, and INAF/OAR)
M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), F. Verrecchia
(SSDC, and INAF/OAR), A. Argan, M. Cardillo, Y. Evangelista, L. Foffano,
E. Menegoni, G. Piano, A. Ursi (INAF/IAPS), A. Addis, L. Baroncelli,
A. Bulgarelli, A. Di Piano, V. Fioretti, G. Panebianco, N. Parmiggiani
(INAF/OAS-Bologna), M. Romani (INAF/OA-Brera), M. Marisaldi
(INAF/OAS-Bologna, Bergen University), M. Pilia, A. Trois (INAF/OA
F. Longo (Uni. Trieste, INFN Trieste), I. Donnarumma (ASI), A. Giuliani
(INAF/IASF-Mi) and P. Tempesta (TeleSpazio) report on behalf of the AGILE

The AGILE satellite detected the GRB 221221A at T0 = 2022-12-21 22:39:30 s
(UTC), reported by Fermi/GBM (GCN #33091).

The burst is clearly visible in the AGILE scientific ratemeters of the
MiniCALorimeter, (MCAL; 0.4-100 MeV) detector. The event lasted about 5 s
and it released a total number of 6515 counts in the MCAL detector
(above a background rate of 1145 Hz). The AGILE ratemeters light curves
can be found at

At the T0, the event was 108.69 deg off-axis.

Additional analysis of AGILE data is in progress. Automatic MCAL GRB alert
Notices can be found at:
Dr. Claudio Casentini, PhD
INAF IAPS - Istituto di Astrofisica e Planetologia Spaziali
Via del Fosso del Cavaliere 100
00133 Roma, Italy
Tel: (+39)3392319601
Email: <>
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