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GCN Circular 31938

Subject
GRB 220423A: AGILE detection
Date
2022-04-23T16:27:04Z (2 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi (INAF/IAPS), C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), M.
Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C.
Casentini, Y. Evangelista, E. Menegoni, L. Foffano, G. Piano (INAF/IAPS),
F. Lucarelli (SSDC, and INAF/OAR), A. Bulgarelli, A. Di Piano, V. Fioretti,
F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M. Marisaldi
(INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois
(INAF/OA-Cagliari), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN
Trieste), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:

On its 15th birthday, the AGILE satellite detected the long GRB 220423A at
T0 = 2022-04-23 14:14:14 (UTC), reported by INTEGRAL SPI-ACS (trigger
no.9870) and CALET (trigger no.1334758343).

The burst is clearly visible in the AGILE scientific ratemeters of the
SuperAGILE (SA; 20-60 keV), MiniCALorimeter (MCAL; 0.4-100 MeV), and
AntiCoincidence (AC; 50-200 keV) detectors. The event lasted about 20 s and
it released a total number of 2150 counts in the SA detector (above a
background rate of 75 Hz), 36645 counts in the MCAL detector (above a
background rate of 1410 Hz), and 81820 counts in the AC detector (above a
background rate of 3220 Hz). The AGILE ratemeter light curves can be found
at http://www.agilescienceapp.it/notices/GRB220423A_AGILE_RM.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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