TITLE: GCN CIRCULAR NUMBER: 9069 SUBJECT: AGILE Gamma-ray detection of GRB 090401B DATE: 09/04/01 13:17:12 GMT FROM: Marco Feroci at IASF/INAF E. Moretti, F. Longo, G. Barbiellini, E. Vallazza (INFN Trieste), A. Giuliani (INAF/IASF Milan), S. Cutini, C. Pittori (ASDC), A. Chen, S. Mereghetti, F. Perotti, P. Caraveo (INAF/IASF Milan), E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, 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), A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), 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: The gamma ray burst 090401B (Schady et al. GCN 9066 & 9067) occurred in the field of view of AGILE, approximately 41 deg off-axis. This 12-s long event was triggered and localized in one dimension by SuperAGILE. It was detected also by the AGILE/ACS and MCAL, with significant detection above 2.8 MeV. A preliminary analysis of the Gamma-Ray Imaging Detector (GRID) data in temporal and spatial coincidence with the GRB shows a significant excess of gamma-ray events above 30 MeV at the location of the event. A more detailed analysis of the AGILE-GRID data is in progress. More observations of this interesting burst are strongly encouraged. This message may be cited.