[vsnet-grb-info 7797] AGILE detection of GRB 090510

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9343
SUBJECT: AGILE detection of GRB 090510
DATE:    09/05/10 19:38:52 GMT
FROM:    Marco Feroci at IASF/INAF  <sa.grb at iasf-roma.inaf.it>

F. Longo, E. Moretti, G. Barbiellini, E. Vallazza (INFN Trieste),
A. Giuliani (INAF/IASF Milan), S. Cutini, C. Pittori (ASDC) M.
Marisaldi, A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco,
C. Labanti, F. Fuschino, M. Galli (INAF/IASF Bologna),
A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan),
Y. Evangelista, E. Del Monte, M. Feroci, I. Donnarumma, L. Pacciani, P.
Soffitta, E. Costa, F. Lazzarotto, I. Lapshov, M. Rapisarda(INAF/IASF  
Rome), A. Pellizzoni, M. Pilia (INAF/OA Cagliari), S. Vercellone  
(INAF/IASF Palermo),
M. Tavani, G. Pucella, F. D'Ammando, V.Vittorini, A. Argan, A. Trois,
G. Piano, S. Sabatini (INAF/IASF Rome), P. Picozza, A. Morselli (INFN  
Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello  
(INFN Roma-1), A. Rappoldi, P. Cattaneo (INFN Pavia) and P. Giommi,   
P. Santolamazza,
F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team,
report:


AGILE detected the remarkable short GRB 090510 (Hoversten et al. GCN
#9331, Ohno et al. GCN #9334) at approximately 61 degrees off-axis.
An analysis of AGILE-GRID data shows an above 5-sigma detection of
gamma-ray emission above 100 MeV. The gamma-ray lightcurve above 100 MeV
shows emission during both the prompt phase and during a "delayed" phase.
Also the Mini-Calorimeter detected a very significant and structured
event lasting ~200 msec with emission well above 3 MeV.
The burst triggered also SuperAGILE, although outside the field of view.
This is the first short GRB with emission above 100 MeV detected by AGILE.