TITLE: GCN CIRCULAR NUMBER: 17276 SUBJECT: GRB 150101B: Fermi GBM detection DATE: 15/01/04 05:56:32 GMT FROM: Matthew Stanbro at UAH/Fermi Matthew Stanbro (UAH) reports on behalf of the Fermi GBM Team: "At 15:23:34.47 UT on 01 January 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 150101B (trigger 441818617 / 150101641). which was also detected by the BAT during a slew (Cummings et al. 2015, GCN 17267). The GBM on-ground location is consistent with the Swift/BAT position. The angle from the Fermi LAT boresight is 44 degrees. The GBM light curve consists of one peak with a duration (T90) of about 0.08 s (50-300 keV). The time-averaged spectrum from T0-0.016 s to T0+0.064 s is best fit by a simple power law function with index -1.70 +/- 0.09. The event fluence (10-1000 keV) in this time interval is (1.09 +/- 0.14)E-07 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.00 s in the 8-1000 keV band is 10.48 +/- 1.35 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."