GCN Circular 18404
O.J. Roberts (UCD) and C.Meegan (UAH) report on behalf of the Fermi GBM Team: "At 09:54:57.83 UT on 06 October 2015, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 151006A (trigger 465818101/151006413), which was also detected by Swift BAT and XRT (Kocevski et al. 2015, GCN 18398). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time using the Swift position is 30 degrees. The GBM light curve consists of a FRED-like peak with a duration (T90) of about 84 s (50-300 keV). The time-averaged spectrum from T0+0 s to T0+83.7 s is best fit by a Band function with Epeak = 227 +/- 53 keV, alpha = -1.17 +/- 0.07, and beta = -1.68 +/- 0.04 The event fluence (10-1000 keV) in this time interval is (1.15 +/- 0.02)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+5.24 s in the 10-1000 keV band is 4.9 +/- 0.2 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."