TITLE: GCN CIRCULAR NUMBER: 15401 SUBJECT: GRB 131029A: Fermi GBM observation DATE: 13/10/30 13:40:38 GMT FROM: Andreas von Kienlin at MPE A. von Kienlin (MPE) and P. Jenke (UAH) report on behalf of the Fermi GBM Team: "At 23:20:48.58 UT on 29 October 2013, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 131029A (trigger 404781651 / 131029973), which was also detected by Fermi/LAT (Racusin et al. 2013, GCN 15399). The GBM on-ground location is consistent with the LAT position. At the time of triggering the angle from the Fermi LAT boresight was 59 degrees. The GBM light curve consists of a double peaked pulse with a duration (T90) of about 105 s (50-300 keV). The time-averaged spectrum from T0-3.072 s to T0+100.353 s is best fit by a Band function with Epeak = 230 +/- 20 keV, alpha = -1.02 +/- 0.04, and beta = -2.1 +/- 0.1. The event fluence (10-1000 keV) in this time interval is (3.0 +/- 0.1)E-05 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+4.2 s in the 10-1000 keV band is 4.6 +/- 0.2 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."