GCN Circular 15104
G. Fitzpatrick (UCD) and G. Younes (NASA/USRA) report on behalf of the Fermi GBM Team: At 01:46:28.52 UT on 16 August 2013, the Fermi Gamma-Ray Burst Monitor triggered and located the precursor to GRB130816A (trigger 398310391/130816074) which was detected by the Swift/BAT (Holland et al. 15097, GCN 14527). The GBM on-ground location is consistent with the Swift position. The GBM light curve consists of the precursor and the main pulse with a duration (T90) of about 32 s (50-300 keV). The time-averaged spectrum from T0+23 s to T0+32 s is adequately fit by a simple power law function with index -1.83 +/- 0.05. The event fluence (10-1000 keV) in this time interval is (1.3 +/- 0.1)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+27 s in the 10-1000 keV band is 1.9 +/- 0.2 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog.