TITLE: GCN CIRCULAR NUMBER: 19797 SUBJECT: GRB 160815A: Fermi GBM detection/observation DATE: 16/08/16 03:00:47 GMT FROM: Rachel Hamburg at UAH R. Hamburg (UAH) reports on behalf of the Fermi GBM Team: "At 11:45:11.64 UT on 15 August 2016, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 160815A (trigger 492954315 / 160815490) which was also detected by the Swift/BAT (Markwardt et al., GCN Circ. 19794) The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 37 degrees. The GBM light curve consists of two peaks with a duration (T90) of about 6.8 s (50-300 keV). The time-averaged spectrum from T0-2.7 s to T0+5.5 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.68 +/- 0.12 and the cutoff energy, parameterized as Epeak, is 71 +/- 4 keV. The event fluence (10-1000 keV) in this time interval is (1.64 +/- 0.06)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.9 s in the 10-1000 keV band is 6.7 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."