GCN Circular 35361

F. Verrecchia (SSDC, and INAF/OAR), C. Casentini (INAF/IAPS), C.
Pittori (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma
Tor Vergata), A. Argan, M. Cardillo, Y. Evangelista, L. Foffano,
G. Piano (INAF/IAPS), L. Baroncelli, A. Bulgarelli, A. Ciabattoni,
A. Di Piano, V. Fioretti (INAF/OAS-Bologna), G. Panebianco (Univ.
Bologna - INAF/OAS Bologna), N. Parmiggiani (INAF/OAS-Bologna),
F. Lucarelli (SSDC, and INAF/OAR), P.W. Cattaneo (INFN Pavia), F.
Longo (Univ. Trieste, and INFN Trieste), M. Marisaldi
(INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois
(INAF/OA-Cagliari), A. Ursi (ASI and INAF/IAPS), I. Donnarumma,
E. Menegoni (ASI), A. Giuliani (INAF/IASF-Mi), F. Cutrona (Univ.
Milano Bicocca) and P. Tempesta (TeleSpazio) report on behalf of
the AGILE Team:

The AGILE satellite detected the GRB 231215A at T0 = 2023-12-15
09:47:17.8 s (UTC), reported by Swift (GCNs #35343, #35345, #35357),
Mondy (GCN #35349), MITSuME (GCN #35351), Astrosat (GCN #35352),
HMT (GCN #35353), GROWTH (GCN #35354).

The event lasted about 12 s and it released a total number of 10990
counts in the MCAL detector RM (above a background rate of 548 Hz)
and 49280 counts in the AC-Top detector RM (above a background
rate of 2741 Hz). The AGILE ratemeters light curves can be
found at

http://www.agilescienceapp.it/notices/GRB231215A_AGILE_RM_ND.png .

The event also triggered a high time resolution MCAL data acquisition,
from T0-22 s s to T0+10 s (UTC), and released 8436 counts in the
detector, above a background rate of 510 Hz.
The MCAL light curve can be found at

http://www.agilescienceapp.it/notices/GRB231215A_086695_629718437.810000.png .

At the T0, the event was 148 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