GCN Circular 6670
Subject
GRB 070724B: Analysis of AGILE gamma-ray data
Date
2007-07-26T15:31:47Z (18 years ago)
From
Sandro Mereghetti at IASF/CNR <sandro@iasf-milano.inaf.it>
A.Chen, S.Vercellone, A.Giuliani, A.Pellizzoni, F.Fornari, S.Mereghetti,
F.Perotti, M.Fiorini, P.Caraveo (IASF-Milano), C.Labanti, M.Marisaldi,
F.Fuschino, M.Galli, A.Bulgarelli, F.Gianotti, M.Trifoglio, G.Di Cocco
(IASF-Bologna), M.Tavani, G.Pucella, F.D'Ammando, E.Costa, M.Feroci,
A.Trois, A.Argan (IASF-Roma), G.Picozza (INFN-Roma), F.Longo,
G.Barbiellini (INFN-Trieste) on behalf of the AGILE Team
and
C. Pittori, P.Giommi, L.A.Antonelli (ASDC), and L. Salotti (ASI) report:
Further analysis of the AGILE GRID (Gamma-Ray Imaging Detector) data of
GRB 070724B (Feroci et al. GCN 6668) confirms the absence of significant
emission at energy above 50 MeV. Only one photon consistent with the
direction of GRB 070724B has been detected by the GRID in a ~100 second
interval around the time of the burst. This is consistent with the
measured background rate.
We note that a gamma-ray flux similar to that observed with EGRET from
GRB930131 (Sommer et al.1994, ApJ 422, L66), would have given about 20
counts in the GRID in the same time interval.
We also analyzed the data of the AGILE Mini-Calorimeter, which provides a
nearly whole-sky monitor in the energy range ~0.35-3 MeV (no directional
information), without finding any statistically significant count rate
increase in correspondence of GRB 070724B.
[GCN OPS NOTE(26jul06): Per author's reuqest, the Subject line was changed
from "070734B" to "070724B".]