TITLE: GCN CIRCULAR NUMBER: 9662 SUBJECT: GRB 090712: Fermi GBM observation DATE: 09/07/13 15:26:01 GMT FROM: Andreas von Kienlin at MPE A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team: "At 03:51:00.34 UT on 12 July 2009, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 090712 (trigger 269063462 / 090712160), which was also detected by the SWIFT-BAT (Holland et al. 2008, GCN 9659, Barthelmy et al., GCN 9660). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 33 degrees. The GBM light curve shows one single pulse with a duration (T90) of about 72 s (8-1000 keV). The time-averaged spectrum from T0-22.528 s to T0+49.153 s is best fit by a power law function with an exponential high energy cutoff. The power law index is -0.68 +/- 0.13 and the cutoff energy, parameterized as Epeak, is 505 +/- 101 keV (chi squared 511 for 486 d.o.f.). The event fluence (8-1000 keV) in this time interval is (4.2 +/- 0.3)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+7.168 s in the 8-1000 keV band is 0.63 +/- 0.04 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."