TITLE: GCN CIRCULAR NUMBER: 15300 SUBJECT: GRB 131002A: Fermi GBM observation DATE: 13/10/04 15:44:29 GMT FROM: Andreas von Kienlin at MPE A. von Kienlin (MPE) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 06:55:06.99 UT on 2 October 2013, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 131002A (trigger 402389709 / 131002288) which was also detected by the Swift/BAT (Barlow et al. 2008, GCN 15283). GBM triggered ~46 sec later than Swift/BAT on the second pulse of the GRB. The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 128.2 degrees. The GBM light curve shows a single pulse with a duration (T90) of about 12 s (50-300 keV). The time-averaged spectrum from T0-4.096 s to T0+4.096 s is well fit by a simple power law function with index -1.6 +/- 0.1 keV. The event fluence (10-1000 keV) in this time interval is (1.4 +/- 0.3)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0 -2.1 s in the 10-1000 keV band is 2.1 +/- 0.4 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."