TITLE: GCN CIRCULAR NUMBER: 9018 SUBJECT: GRB 090320A: Fermi GBM detection DATE: 09/03/23 14:53:00 GMT FROM: Arne Rau at MPE Arne Rau (MPE) reports on behalf of the Fermi GBM Team: "At 10:01:46 UT on 20 March 2009, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 090320A (trigger 259236108 / 090320.418). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 242.4, Dec = -51.9 (J2000 degrees, equivalent to J2000 16h 10m, +/-51d 54'), with a statistical uncertainty of 10.8 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The GBM light curve shows a single peak with a duration (T90) of about 10 s (8-1000 keV). The reliability for T90 is low due to strong background fluctuations. The angle from the Fermi LAT boresight is 60 degrees. Since the source is weak, the time-averaged spectrum is poorly constrained."