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GCN Circular 33148

Subject
GRB 230104A: AGILE/MCAL detection of a burst
Date
2023-01-04T09:40:45Z (a year ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi (INAF/IAPS), F. Longo (Univ. Trieste and INFN Trieste), 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. Addis, L. Baroncelli, A. Bulgarelli, A. Di Piano, V. Fioretti, G.
Panebianco, N. Parmiggiani (INAF/OAS-Bologna), F. Lucarelli, C. Pittori, F.
Verrecchia (SSDC, and INAF/OAR), M. Romani (INAF/OA-Brera), M. Marisaldi
(INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois
(INAF/OA-Cagliari), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), and P.
Tempesta (TeleSpazio), report on behalf of the AGILE Team:

The AGILE Mini-CALorimeter (MCAL) detected a burst at T0 = 2023-01-04
06:03:15.00 +/- 0.01 s (UTC). The event lasted about 1.10 s and released a
total number of 2073 counts in the MCAL detector (in the 0.4-100 MeV energy
range), above an average background rate of 594 Hz. The MCAL light curve
can be found at
http://www.agilescienceapp.it/notices/GRB230104A_081663_599896995.000000.png
.

The burst is also visible in the AGILE scientific ratemeters of the
MiniCALorimeter (MCAL; 0.4-100 MeV), and AntiCoincidence (AC; 50-200 keV)
detectors, where it released a total number of 6525 counts in the MCAL
detector (above a background rate of 1200 Hz), and 13285 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/GRB230104A_AGILE_RM_D.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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