TITLE: GCN CIRCULAR NUMBER: 10164 SUBJECT: GRB 091112: Fermi GBM observation DATE: 09/11/13 00:30:38 GMT FROM: Michael S. Briggs at UAH and MSFC M. S. Briggs (UAH) reports on behalf of the Fermi GBM Team: "At 17:41:15.82 UT on 12 Nov 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 091112 (trigger 279740477 / 091112.737), which was also detected by the SWIFT-BAT (V. Mangano et al., GCN 10162) The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 82 degrees. The GBM light curve consists primarily of a broad peak, and has a duration of about 40 seconds. The time-averaged spectrum from T0-0.512 s to T0+24.064 s is best fit by a power law function with an exponential high energy cutoff. The power law index is -1.13 +/- 0.04 and the cutoff energy, parameterized as Epeak, is 750 +/- 120 keV. C-Stat = 717 for 483 degrees of freedom. The event fluence (10-1000 keV) in this time interval is (9.7 +/- 0.3)E-6 erg/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."