[vsnet-grb-info 28039] GRB 210606B: AGILE detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  30142
SUBJECT: GRB 210606B: AGILE detection
DATE:    21/06/07 11:44:52 GMT
FROM:    Alessandro Ursi at INAF/IAPS  <alessandro.ursi at gmail.com>

A. Ursi (INAF/IAPS), 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, 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:

The AGILE satellite detected the long GRB 210606B at T0 = UTC 2021-06-06
22:41:03 s (UTC), reported by Fermi/GBM (Trigger no. 644712030), GECAM (GCN
#39138), and BALROG (GCN #39139).

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 ~35 s and released a total
number of 3120 counts in the SA detector (above a background rate of 66
Hz), 43110 counts in the MCAL detector (above a background rate of 1250
Hz), and 125100 counts in the AC detector (above a background rate of 3660
Hz). The AGILE ratemeter light curves can be found at
http://www.agilescienceapp.it/notices/GRB210606B_AGILE_RM.png .

The event also triggered a partial high time resolution MCAL data
acquisition at T = UTC 2021-06-06 22:41:13.18 +/- 0.01 s, whose light curve
can be found at:
http://www.agilescienceapp.it/notices/073374_GRB_550104073.181294.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.