GCN Circular 15360
Bin-Bin Zhang(UAH) reports on behalf of the Fermi GBM Team: "At 16:08:39.181 UT on October 18 2013, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 131018B (trigger 403805322/131018673), which is also detected by Fermi/LAT (Vianello et al. GCN 15357). The GBM on-ground location is consistent with the LAT position (Vianello et al., GCN 15357). The angle from the Fermi LAT boresight is 23 degrees. The GBM light curve consists of one FRED-shape pulse with a duration (T90) of about 38 s (50-300 keV). The time-averaged spectrum from T0+0 s to T0+30 s is well best fit with a power law function with an exponential high-energy cutoff parameterized as Epeak = 77 +/- 7 keV and an Index = -0.25 +/- 0.30. The event fluence (10-1000 keV) in this time interval is (2.14 +/- 0.16)E-06 erg/cm^2. The 1.0-sec peak photon flux measured starting from T0+1 s in the 10-1000 keV band is 2.2 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."