GCN Circular 7866
Subject
GRB 080607: AGILE-MCAL observation of the prompt emission
Date
2008-06-09T15:44:57Z (16 years ago)
From
Marco Feroci at IASF/INAF <feroci@iasf-roma.inaf.it>
M. Marisaldi, F. Fuschino, M. Galli, C. Labanti, A. Bulgarelli, F.
Gianotti, M. Trifoglio, G. Di Cocco (INAF/IASF Bologna), E. Costa, E. Del
Monte, I. Donnarumma, Y. Evangelista, M. Feroci, I. Lapshov, F.
Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta (INAF/IASF Roma), F.
Fornari, A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A.
Pellizzoni, F. Perotti, M. Fiorini, P. Caraveo (INAF/IASF Milano), M.
Tavani, G. Pucella, F. D'Ammando, V. Vittorini, A. Argan, A. Trois
(INAF/IASF Rome), G. Barbiellini, F. Longo, E. Vallazza (INFN Trieste), P.
Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria),
P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, (ASDC) and
L. Salotti (ASI), on behalf of the AGILE Team, report:
"The Swift localized GRB 080607 (Mangano et al., GCN 7847; Stamatikos et
al., GCN 7852) triggered the Mini-Calorimeter (MCAL) instrument onboard
the AGILE satellite at 06:07:23 UT (=T0). The MCAL instrument covers the
energy range 350 keV - 10 MeV, without imaging capabilities.
Using the preliminary in-flight calibration and assuming a Crab-like
spectrum, we can estimate the fluence in the 350-700 keV energy band to be
(23 +/- 7) photons/cm2 corresponding to (1.8 +/- 0.5)x10^-5 erg/cm2, in
the time interval T0-T0+14 s. The 1-s peak flux measured at T0+5.1 s is
(4.2 +/- 1.2) photons/cm2/s in the same energy band. The GRB was detected
also in the 1.4-2.8 MeV energy band with a 10 sigma significance in the
256-ms time window.
We note that the quoted fluence is in agreement within errors with that
obtained using the Konus-Wind spectrum reported in Golenetskii et al., GCN
7862. Assuming the spectral model reported in GCN 7862, an agreement in
flux within 10% for the energy band 350-700 keV is obtained.
The Swift localization is at about 113 degrees off-axis with respect to
the AGILE pointing, so well out of the field of view of the AGILE
Gamma-Ray Imaging Detector (GRID), sensitive in the 50 MeV - 50 GeV energy
range. Analysis of the GRID count rate does not show any detection.
This GRB triggered also SuperAGILE and was detected at about 17 sigma
significance level in the 18-60 keV band, although it was well outside the
field of view, and was detected through the collimator shielding."
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