TITLE:   GCN CIRCULAR
NUMBER:  33272
SUBJECT: GRB 230204B: AGILE detection
DATE:    23/02/05 11:56:28 GMT
FROM:    Claudio Casentini at INAF-IAPS  <claudio.casentini@inaf.it>

C. Casentini (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR),
M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), F. Verrecchia,
F.Lucarelli
(SSDC, and INAF/OAR), A. Argan, M. Cardillo, 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),
M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OAS-Bologna, Bergen
University),
M. Pilia, A. Trois (INAF/OA Cagliari), F. Longo (Uni. Trieste, INFN
Trieste),
I. Donnarumma, A.Ursi (ASI), A. Giuliani (INAF/IASF-Mi) and P. Tempesta
(TeleSpazio),
report on behalf of the AGILE Team:

The AGILE satellite detected the bright and long GRB 230204B at
T0 = 2023-02-04 21:44:25.2 s (UTC), reported by MAXI/GSC, Swift/BAT-GUANO,
AstroSAT CZTI, GIT (GCNs #33265, #33267, #33268 and #33269), CALET trig
1359582171, Fermi/GBM trig 697239872 and INTEGRAL trig 10188.

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 145 s and it released a total number of 170125
counts
in the MCAL detector (above a background rate of 1418 Hz), and 468843
counts in the AC
detector (above a background rate of 3197 Hz). The AGILE ratemeters light
curves
can be found at
http://www.agilescienceapp.it/notices/GRB230204B_AGILE_RM_A.png .

The event also triggered a partial high-time resolution MCAL data
acquisition,
from T0-20 s to T0+25 s (UTC). The multi-peaked MCAL light curve can be
found
at
http://www.agilescienceapp.it/notices/GRB230204B_082123_602631919.000000.png
.

At the T0, the event was 72 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