TITLE: GCN CIRCULAR NUMBER: 13437 SUBJECT: GRB 120711A: Fermi GBM observation DATE: 12/07/11 10:18:39 GMT FROM: David Gruber at MPE David Gruber (MPE) and Véronique Pelassa (UAH) report on behalf of the Fermi GBM Team: "At 02:44:53.29 UT on 11 July 2012, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 120711A (trigger 363667496 / 120711115). which was also detected by the INTEGRAL/IBAS (Gotz et al. 2012, GCN 13434). The GBM on-ground location is consistent with the INTEGRAL position. The angle from the Fermi LAT boresight is 140 degrees. Moreover, this burst was bright enough to result in a Fermi spacecraft autonomous rapid repoint (ARR) maneuver. This burst was also independently detected by INTEGRAL SPI-ACS. The GBM light curve consists of a precursor which is followed by a hard, main emission after ~ 50 s, lasting for another ~ 50 s. The T90 is about 44 s (50-300 keV). The time-averaged spectrum from T0-1 s to T0+131 s is best fit by a Band function with Epeak = 973 +/- 35 keV, alpha = -0.94 +/- 0.01, and beta = -2.40 +/- 0.04. This spectrum is typical of a bright, hard GRB, and would be highly unusual for an X-ray transient (Bozzo et al. 2012, GCN 13435). The event fluence (10-1000 keV) in this time interval is (1.942 +/- 0.002)E-04 erg/cm^2. The 1-sec peak photon flux measured starting from T0+95 s in the 10-1000 keV band is 26.7 +/- 0.6 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."