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GCN Circular 31975

Subject
GRB 220430A: AGILE detection
Date
2022-04-30T19:06:05Z (2 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi (INAF/IAPS), F. Longo (Univ. Trieste and INFN Trieste), F.
Verrecchia, C. Pittori (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), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:

The AGILE satellite detected the GRB 220430A at T0 = 2022-04-30 13:53:45
(UTC), reported by Swift (GCNs #31972 and #31973).

The burst is clearly visible in the AGILE scientific ratemeters of the
SuperAGILE detector (SA; 20-60 keV) and in all the five panels of the
AntiCoincidence system (AC Top, 50-200 keV; AC Lat, 80-200 keV). The event
lasted about 25 s and it released a total number of 2685 counts in the SA
detector (above a background rate of 100 Hz), 25765 counts in the MCAL
detector (above a background rate of 1070 Hz), and 67565 counts in the AC
detector (above a background rate of 2710 Hz). The AGILE ratemeter light
curves can be found at
http://www.agilescienceapp.it/notices/GRB220430A_AGILE_RM.png .

As pointed out in GCN #31972, we notice that this event took place at the
end of an intense X-class solar flare, clearly detected by all the AGILE
scientific ratemeters. A more extended light curve can be found at
http://www.agilescienceapp.it/notices/GRB220430A_AGILE_RM_all.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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