TITLE: GCN CIRCULAR NUMBER: 17975 SUBJECT: GRB 150627A: Fermi GBM observation DATE: 15/06/27 16:03:39 GMT FROM: Hoi-Fung Yu at MPE H.-F. Yu (MPE), E. Burns, V. Connaughton, A. Goldstein (UAH), and M. Gibby (Jacobs) report on behalf of the Fermi GBM Team: "At 04:23:23.68 UT on 27 June 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150627A (trigger 457071806 / 150627183), which was also detected by the Fermi LAT (Arimoto et al., GCN 17971). The GBM on-ground location is consistent with the LAT position. The GBM trigger resulted in an Autonomous Repoint Request (ARR) that was accepted and the spacecraft slewed to the GBM in-flight location. At the GBM trigger time, the angle of the LAT localization to the LAT boresight is 75 deg. The GBM light curve consists of multiple pulses with a duration (T90) of about 65 s (50-300 keV). The time-averaged spectrum from T0-3.072 s to T0+92.161 s is best fit by a Band function with Epeak = 233 +/- 5 keV, alpha = -1.04 +/- 0.01, and beta = -2.18 +/- 0.02. The event fluence (10-1000 keV) in this time interval is (1.90 +/- 0.01)E-4 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+59.521 s in the 10-1000 keV band is 65.2 +/- 0.6 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."