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GCN Circular 33138

Subject
GRB 230102A: AGILE/MCAL detection
Date
2023-01-02T11:07:23Z (a year ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR), 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, 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), F. Longo (Univ.
Trieste and INFN Trieste), 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 the GRB 230102A at T0 =
2023-01-02 00:22:12.97 +/- 0.01 s (UTC), reported by Fermi GBM (GCN #33137).

The event lasted about 0.16 s and released a total number of 219 counts in
the MCAL detector (in the 0.4-100 MeV energy range), above an average
background rate of 489 Hz. The MCAL light curve can be found at
http://www.agilescienceapp.it/notices/GRB230102A_081632_599703732.970000.png
. The time-integrated spectrum of the burst, from T0-0.032 s to T0+0.128 s,
can be fitted in the energy range 0.4-2 MeV with a power-law with ph.ind. =
-2.48 (-0.46,+0.51), resulting in a reduced chi-squared of 0.85 (21 d.o.f.)
and a fluence of 1.07e-06 erg/cm^2 (90% confidence level), in the same
energy range. At the T0, the event was 100 deg off-axis.

The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the
energy range 0.4-100 MeV. 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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