TITLE: GCN CIRCULAR NUMBER: 8003 SUBJECT: GRB 080723B: Detection and Localization by SuperAGILE DATE: 08/07/23 14:47:13 GMT FROM: Marco Feroci at IASF/INAF E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, E. Costa, I. Lapshov, F. Lazzarotto, L. Pacciani, M. Rapisarda, P. Soffitta, (INAF/IASF Rome), A. Giuliani, S. Vercellone, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, P. Caraveo (INAF/IASF Milan), 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 (INAF/IASF Rome), G. Barbiellini, F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), and P. Giommi, C. Pittori, B. Preger, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI), on behalf of the AGILE Team, report: "SuperAGILE detected and localized a very bright gamma ray burst on July 23rd 2008, at 13:22:19 UT. The event was approximately 13 degrees off-axis. The observed duration in the 20-60 keV energy range is about 110 seconds, with a multi-peaked structure. The burst position was reconstructed as (RA, Dec) (176.823 deg, -60.262 deg), which is: RA(J2000) = 11h 47m 17.42s Dec(J2000) = -60d 15' 43.7" with an uncertainty of 3' radius. The given uncertainty accounts for both the statistical and systematic errors. The same event was also localized and announced by INTEGRAL/ISGRI (BACODINE trigger n. 5311, and Gotz et al., GCN 8002). The SuperAGILE position lies at 1.1 arcmin from the one reported in the INTEGRAL off-line analysis. A SuperAGILE light curve of the event will shortly be posted on the AGILE Science Data Center website: http://agile.asdc.asi.it . An analysis of the AGILE Gamma Ray Imager (GRID) data is in progress." This message may be cited.