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GCN Circular 33325

Subject
GRB 230209B: AGILE detection
Date
2023-02-15T10:57:52Z (a year ago)
From
Claudio Casentini at INAF-IAPS <claudio.casentini@inaf.it>
C. Casentini (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata),
C. Pittori, F. Lucarelli, F. Verrecchia (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), F. Longo (Uni. Trieste, INFN
Trieste),
M. Pilia, A. Trois (INAF/OA Cagliari), 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 GRB 230209B at T0 = 2023-02-09 22:32:37 s
(UTC),
reported by Fermi/GBM (GCN #33310, GCN #33324), Swift/BAT (GCN #33315),
IPN network (GCN #33323) and Global MASTER-Net (GCN #33311).

The burst is clearly visible in the AGILE scientific ratemeters of the
MiniCALorimeter
(MCAL; 0.4-100 MeV) and in four out of five panels of the AntiCoincidence
system
(AC Top, 50-200 keV; AC Lat, 80-200 keV). The event lasted about 6.2 s and
it
released a total number of 4642 counts in the MCAL detector (above a
background rate
of 656 Hz), and 25551 counts in the AC Top detector (above a background
rate of
3547 Hz). The AGILE ratemeters light curves can be found at:
http://www.agilescienceapp.it/notices/GRB230209B_AGILE_RM_ND.png.

The event also triggered a high-time resolution MCAL data acquisition, from
T0-4 s
to T0+9 s (UTC), and released 2587 counts in the detector, above a
background rate
of 579.10 Hz. The MCAL light curve can be found at:
http://www.agilescienceapp.it/notices/GRB230209B_082193_603066757.789296.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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