GCN Circular 14663
P. Jenke (UAH) reports on behalf of the Fermi GBM Team: "At 01:21:17.88 UT on May 15 2013, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 130515A (trigger 390273680 / 130515056), which was also detected by the Swift/BAT (Malesani et al., GCN Circ. 14650). The GBM on-ground location is consistent with the Swift position. The angle of the Fermi LAT boresight is 120 degrees from the Swift location. The GBM light curve consists of a single pulse with a FRED-like shape with a duration (T90) of about 0.26 s (50-300 keV). The time-averaged spectrum from T0-0.064 s to T0+0.256 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -1.90 +/- 0.08 and the cutoff energy, parameterized as Epeak, is 450 +/- 100 keV. The event fluence (10-1000 keV) in this time interval is (10.4 +/- 0.5)E-07 erg/cm^2. The 0.064-sec peak photon flux measured starting from T0+0.0 s in the 10-1000 keV band is 22 +/- 2 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."