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GCN Circular 35061

GRB 231115A: AGILE/MCAL upper limits
2023-11-16T11:53:27Z (6 months ago)
Francesco Verrecchia at SSDC,INAF-OAR <>
C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS,
and Univ. Roma Tor Vergata), C. Casentini, L. Foffano (INAF/IAPS),
G. Piano (INAF/IAPS), A. Ursi (ASI and INAF/IAPS), L. Baroncelli,
A. Bulgarelli, A. Ciabattoni, A. Di Piano, V. Fioretti, G. Panebianco,
N. Parmiggiani (INAF/OAS-Bologna), M. Pilia (INAF/OA-Cagliari),
P.W. Cattaneo (INFN Pavia), F. Cutrona (Univ. Milano Bicocca),
F. Longo (Univ. Trieste, and INFN Trieste), report on behalf
of the AGILE Team:

AGILE observed the short GRB 231115A first reported by Fermi GBM at
T0 = 15:36:21 UT on 15 Nov 2023 (GCN #35035) and significantly localized
by INTEGRAL in M82 (GCN #35036, #35037, #35038), suggesting a possible
magnetar giant flare origin (also GCN #35044).

The GRB location was fully accessible to the AGILE MCAL at about 70
degrees off-axis, but no trigger occured around +/- 50 sec from T0.

The three-sigma upper limit (UL) obtained for a 1 s integration time
at  the GRB position is 1.3E-06 erg cm^-2 (assuming as spectral model a
single power law with photon index 1.5).

The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive
in the energy range 0.4-100 MeV. Additional analysis of AGILE data
is in progress.

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