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GCN Circular 33412

Subject
GRB 230307A: AGILE/MCAL detection
Date
2023-03-07T22:40:47Z (a year ago)
From
Claudio Casentini at INAF-IAPS <claudio.casentini@inaf.it>
C. Casentini (INAF/IAPS), M. Tavani (INAF/IAPS, and Uni.Roma Tor Vergata),
C. Pittori, F. Lucarelli, F. Verrecchia (SSDC, and INAF/OAR)
A. Argan, M. Cardillo, Y. Evangelista, L. Foffano, G. Piano (INAF/IAPS),
A. Addis, L. Baroncelli, A. Bulgarelli, A. Di Piano, V. Fioretti,
G. Panebianco, N. Parmiggiani (INAF/OAS-Bologna),
F. Longo (Uni. Trieste, INFN Trieste), M. Romani (INAF/OA-Brera),
M. Marisaldi (INAF/OAS-Bologna, Bergen University), M. Pilia,
A. Trois (INAF/OA Cagliari), I. Donnarumma, E. Menegoni, A.Ursi (ASI),
A. Giuliani (INAF/IASF-Mi) and P. Tempesta (TeleSpazio),
report on behalf of the AGILE Team:

The AGILE satellite detected the long GRB 230307A at
T0 = 2023-03-07 15:44:06 (UTC), reported by Fermi/GBM (GCN #33405 and
GCN #33407), GECAM (GCN #33406) and Stix (GCN #33410).

The burst is clearly visible in the AGILE scientific ratemeters of the
MiniCALorimeter (MCAL; 0.4-100 MeV), and in all the panels of the
AntiCoincidence detectors (AC Top, 50-200 keV; AC Lat, 80-200 keV).
The event lasted about 30 s and it released a total number of 527069 counts
in the MCAL detector (above a background rate of 1154 Hz), and 920952 counts
in the AC Top detector (above a background rate of 2959 Hz).
The AGILE ratemeters light curves can be found at:
http://www.agilescienceapp.it/notices/GRB230307A_AGILE_RM_ND.png .

The event also triggered a high-time resolution MCAL data acquisition,
from T0 to T0+22 s (UTC), and released 241403 counts in the detector,
above a background rate of 510 Hz. The MCAL light curve can be found at:
http://www.agilescienceapp.it/notices/GRB230307A_082567_605288646.000000.png
.

At the T0, the event was 54 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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