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GCN Circular 32259

Subject
GRB 220624A: AGILE detection
Date
2022-06-24T14:47:15Z (2 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi, L. Foffano (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor
Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, E. Menegoni,
G. Piano (INAF/IAPS), A. Bulgarelli, A. Di Piano, V. Fioretti, N.
Parmiggiani (INAF/OAS-Bologna), F. Lucarelli, C. Pittori, 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), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), F.
Longo (Univ. Trieste and INFN Trieste), and P. Tempesta (TeleSpazio),
report on behalf of the AGILE Team:

The AGILE satellite detected the long GRB 220624A at T0 = 2022-06-24
02:58:35 s (UTC), reported by Fermi GBM (GCN #32256). 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 57 s and it released a total number
of 5930 counts in the SA detector (above a background rate of 70 Hz), 88920
counts in the MCAL detector (above a background rate of 1135 Hz), and
212145 counts in the AC detector (above a background rate of 3195 Hz). The
AGILE ratemeters light curves can be found at
http://www.agilescienceapp.it/notices/GRB220624A_AGILE_RM.png .

The event also triggered a partial high time resolution MCAL data
acquisition, from T1 = 2022-06-24 02:58:34.36 s (UTC) to T2 = 2022-06-24
02:58:46.85 s (UTC), and released 14630 counts in the detector, above a
background rate of 620 Hz. The MCAL light curve can be found at
http://www.agilescienceapp.it/notices/GRB220624A_078864_583124315.000000.png
. At the T0, the event was 20 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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