TITLE:   GCN CIRCULAR
NUMBER:  33585
SUBJECT: GRB 230405B: AGILE detection
DATE:    23/04/07 08:42:42 GMT
FROM:    Claudio Casentini at INAF-IAPS  <claudio.casentini@inaf.it>

C. Casentini, M. Cardillo (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR),
M. Tavani (INAF/IAPS and Uni. Roma Tor Vergata), F. Lucarelli,
F. Verrecchia(SSDC, and INAF/OAR), A. Argan, Y. Evangelista, L. Foffano,
G. Piano (INAF/IAPS), A. Addis, L. Baroncelli, A. Bulgarelli, A. Di Piano,
V. Fioretti, G.Panebianco, N. Parmiggiani (INAF/OAS-Bologna),
M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OAS-Bologna, Bergen
University),
M. Pilia, A. Trois (INAF/OA Cagliari), I. Donnarumma, E. Menegoni, A.Ursi
(ASI),
A. Giuliani (INAF/IASF-Mi) and P. Tempesta (TeleSpazio),
report on behalf of the AGILE Team:

The AGILE satellite detected the GRB 230405B at T0 = 2023-04-05 19:58:03 s
(UTC),
reported by Fermi (GCNs #33570, #33583), Swift (GCNs #33571, #33572,
#33574, #33576,
#33584), AstroSat CZTI (GCN #33575), MeerLICHT (GCN #33582), and Global
MASTER-Net
(GCN #33573).

The burst is clearly visible in the AGILE scientific ratemeters of the
MiniCALorimeter (MCAL; 0.4-100 MeV), and AntiCoincidence (AC; 50-200 keV)
detectors.
The event lasted about 5 s and it released a total number of 3105 counts in
the MCAL
detector (above a background rate of 539 Hz), and 16691 counts in AC-Top
detector
(above a background rate of 2650 Hz). The AGILE ratemeters light curves can
be found
at http://www.agilescienceapp.it/notices/GRB230405B_AGILE_RM_ND.png .

At the T0, the event was 83 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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