TITLE: GCN CIRCULAR NUMBER: 13809 SUBJECT: GRB 120922A: Fermi GBM detection DATE: 12/09/23 18:23:16 GMT FROM: George A. Younes at USRA/NASA/MSFC George Younes (MSFC/USRA) reports on behalf of the Fermi GBM Team: "At 22:32:09.47 UT on 22 September 2012, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 120922A (trigger 370045932 / 120922939) which was also detected by the Swift/BAT (Yershov et al. 2012, GCN 13793). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 85 degrees. The GBM light curve consists of a multiple peaks with a duration (T90) of about 180 s (50-300 keV). The time-averaged spectrum from T0-121 s to T0+6 s is best fit by a Band function with Epeak = 37.7 +/- 3.5 keV, alpha = 1.6 +/- 0.7 , and beta = -2.3 +/- 0.1. The event fluence (10-1000 keV) in this time interval is (6.5 +/- 0.4)E-06 ergs/cm^2. The 1-sec peak photon flux measured starting from T0-1.8 s in the 10-1000 keV band is 3.4 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."