TITLE: GCN CIRCULAR NUMBER: 18375 SUBJECT: GRB 151001A: Fermi GBM detection DATE: 15/10/02 01:01:32 GMT FROM: Bagrat Mailyan at UAH B. Mailyan (UAH), P. Veres (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 15:04:22.41 UT on 01 October 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 151001A (trigger 465404666 / 151001628) which was also detected by the Swift/BAT and XRT (M. Stamatikos et al. 2015, GCN 18373) The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 22 degrees. The GBM light curve has a duration (T90) of about 15.1 s (50-300 keV). The time-averaged spectrum from T0-6.1 s to T0+4.1 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -0.54 +/- 0.21 and the cutoff energy, parameterized as Epeak, is 213.80 +/- 36.90 keV. The event fluence (10-1000 keV) in this time interval is (1.798 +/- 0.195)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+2.75 s in the 10-1000 keV band is 2.2 +/- 0.2 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."