[vsnet-grb-info 27888] GRB 210511B: AGILE detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29991
SUBJECT: GRB 210511B: AGILE detection
DATE:    21/05/11 17:11:19 GMT
FROM:    Alessandro Ursi at INAF/IAPS  <alessandro.ursi at gmail.com>

A. Ursi (INAF/IAPS), V. Fioretti (INAF/OAS-Bologna), M. Tavani (INAF/IAPS,
and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y.
Evangelista, G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia
(SSDC, and INAF/OAR), A. Bulgarelli, A. Di Piano,  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:

The AGILE satellite detected the long GRB 210511B at T0 = 2021-05-11
11:26:37 s (UTC), reported by Fermi/GBM (GCN #29988) and GECAM (GCN #29990).

The burst is 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 ~12 s and released a total
number of 2120 counts in the SA detector (above a background rate of 64
Hz), 15630 counts in the MCAL detector (above a background rate of 1260
Hz), and 48375 counts in the AC detector (above a background rate of 3865
Hz). The AGILE ratemeter light curves can be found at
http://www.agilescienceapp.it/notices/GRB210511_AGILE_RM.png .

Additional analysis of AGILE data is in progress.