GCN Circular 20940
E. Bissaldi (Politecnico & INFN Bari), M. Stanbro, and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 07:56:58.04 UT on 25 March 2017, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 170325A (trigger 512121423/170325331), which was also detected by the Swift/BAT (Palmer et al. 2017, GCN 20938). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 60 degrees. The GBM light curve consists of a single peak with a duration (T90) of about 0.58 s (50-300 keV). The time-averaged spectrum from T0-0.064 s to T0+0.192 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -0.7 +/- 0.2 and the cutoff energy, parameterized as Epeak, is 600 +/- 200 keV. The event fluence (10-1000 keV) in this time interval is (4.8 +/- 0.6)E-7 erg/cm^2. The 64-ms peak photon flux, measured starting from T0 in the 10-1000 keV band, is 7.6 +/- 1.1 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."