TITLE: GCN CIRCULAR NUMBER: 33325 SUBJECT: GRB 230209B: AGILE detection DATE: 23/02/15 10:57:52 GMT FROM: Claudio Casentini at INAF-IAPS C. Casentini (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), C. Pittori, F. Lucarelli, F. Verrecchia (SSDC, and INAF/OAR), A. Argan, M. Cardillo, Y. Evangelista, L. Foffano, E. Menegoni, G. Piano (INAF/IAPS), A. Addis, L. Baroncelli, A. Bulgarelli, A. Di Piano, V. Fioretti, G. Panebianco, N. Parmiggiani (INAF/OAS-Bologna), M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OAS-Bologna, Bergen University), F. Longo (Uni. Trieste, INFN Trieste), M. Pilia, A. Trois (INAF/OA Cagliari), I. Donnarumma, A.Ursi (ASI), A. Giuliani (INAF/IASF-Mi) and P. Tempesta (TeleSpazio), report on behalf of the AGILE Team: The AGILE satellite detected the GRB 230209B at T0 = 2023-02-09 22:32:37 s (UTC), reported by Fermi/GBM (GCN #33310, GCN #33324), Swift/BAT (GCN #33315), IPN network (GCN #33323) and Global MASTER-Net (GCN #33311). The burst is clearly visible in the AGILE scientific ratemeters of the MiniCALorimeter (MCAL; 0.4-100 MeV) and in four out of five panels of the AntiCoincidence system (AC Top, 50-200 keV; AC Lat, 80-200 keV). The event lasted about 6.2 s and it released a total number of 4642 counts in the MCAL detector (above a background rate of 656 Hz), and 25551 counts in the AC Top detector (above a background rate of 3547 Hz). The AGILE ratemeters light curves can be found at: http://www.agilescienceapp.it/notices/GRB230209B_AGILE_RM_ND.png. The event also triggered a high-time resolution MCAL data acquisition, from T0-4 s to T0+9 s (UTC), and released 2587 counts in the detector, above a background rate of 579.10 Hz. The MCAL light curve can be found at: http://www.agilescienceapp.it/notices/GRB230209B_082193_603066757.789296.png . Additional analysis of AGILE data is in progress. Automatic MCAL GRB alert Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html