GCN Circular 25577
Subject
GRB 190829A: AGILE ratemeters detection and MCAL upper limits
Date
2019-08-30T13:16:54Z (5 years ago)
From
Carlotta Pittori at ASI SSDC, INAF-OAR <carlotta.pittori@ssdc.asi.it>
C. Pittori (SSDC, and INAF/OAR), A. Ursi (INAF/IAPS), M. Tavani
(INAF/IAPS, and Univ. Roma Tor Vergata), M. Cardillo, C. Casentini,
G. Piano (INAF/IAPS), F. Lucarelli, F. Verrecchia (SSDC, and INAF/OAR),
A. Bulgarelli, V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna),
M. Pilia (INAF/OA-Cagliari), F. Longo (Univ. Trieste, and INFN Trieste),
report on behalf of the AGILE Team:
AGILE observed the long GRB 190829A at T0 = 2019-08-29 19:55:53 (UT)
first reported by Fermi GBM (GCN 25551) and by Swift (GCN 25552).
The scientific ratemeters of the Anti-Coincidence (50-200 keV) and
Super-AGILE (SA; 18-60 keV) detected the burst.
The GRB 190829A was also seen at VHE gamma-ray energy by
H.E.S.S.(GCN 25566).
The GRB location was fully accessible to the AGILE MCAL, but no trigger
occured around +/- 100 sec from T0.
Three-sigma upper limits (ULs) are obtained for a 1 s integration
time at different celestial positions from a minimum of
1.16E-06 erg cm^-2 to a maximum of 1.36E-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.
The GRB 190829A position has optimal exposure also in the AGILE
field of View of the Gamma-Ray Imaging Detector (GRID) and
further analyses are still in progress.