TITLE: GCN CIRCULAR NUMBER: 18015 SUBJECT: GRB 150711A: Fermi GBM detection DATE: 15/07/12 02:08:36 GMT FROM: Peter Jenke at MSFC P. Jenke (UAH) reports on behalf of the Fermi GBM Team: "At 18:23:00.16 UT on July 11 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150711A (trigger 458331784/150711766), which was also detected by Swift (M. G. Bernardini (INAF-OAB) et al. 2015, GCN 18011). The GBM on-ground location, using the Fermi GBM trigger data, is consistent with the Swift/XRT location. The angle of the burst direction to the Fermi LAT boresight is 28 degrees. The GBM light curve is a single peak with a duration (T90) of about 14s (50-300 keV). The time-averaged spectrum from T0-13s to T0+19s is well fit by a power law with an exponential high-energy cutoff. The power law index is -1.16 +/- 0.07 and the cutoff energy, parameterized as Epeak, is 117 +/- 10 keV. The event fluence (10-1000 keV) in this time interval is (2.8 +/- 0.06)E-06 ergs/cm^2. The 1.0-sec peak photon flux measured starting from T0+4.7s in the 10-1000 keV band is 4.1 +/- 0.2 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."