TITLE: GCN CIRCULAR NUMBER: 8930 SUBJECT: GRB 090304: Fermi GBM detection DATE: 09/03/04 16:14:43 GMT FROM: Arne Rau at MPE Arne Rau (MPE) reports on behalf of the Fermi GBM Team: "At 05:10:48.16 UT on 04 March 2009, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 090304 (trigger 257836250 / 090304.216). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 246.4, Dec = -80.9 (J2000 degrees, equivalent to J2000 16h 25m, -80d 54'), with a statistical uncertainty of 13.1 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT boresight is 31 degrees. Since the source is weak, the time-averaged spectrum is poorly constrained. This event has also been detected by INTEGRAL SPI-ACS."