TITLE: GCN CIRCULAR NUMBER: 9421 SUBJECT: GRB 090513B: Fermi GBM detection DATE: 09/05/23 22:06:17 GMT FROM: Vandiver Chaplin at UAH/Fermi-GBM V. Chaplin (UAH) reports on behalf of the Fermi GBM Team: "At 22:35:35.34 UT on 13 May 2009, the Fermi Gamma-Ray Burst Monitor triggered and located the weak GRB 090513B (trigger 263946937 / 090513941). The on-ground calculated location, using the GBM trigger data, is RA = 99.1, DEC = -72.9 (J2000 degrees, equivalent to 6 h 36 m, -72 d 54 '), with an uncertainty of 8.8 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT boresight is 119 degrees. Since the source is weak, the time-averaged spectrum is poorly constrained."