TITLE: GCN CIRCULAR NUMBER: 16889 SUBJECT: GRB 141005A: Fermi GBM Detection DATE: 14/10/05 15:32:52 GMT FROM: Oliver Roberts at UCD/Fermi O. Roberts (UCD) reports on behalf of the Fermi GBM Team: "At 05:13:06.97 UT on the 5th of October 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 141005A (trigger 434178789 / 141005217) which was also detected by Swift (V. D'Elia et al. 2014, GCN 16682). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight is 107 degrees. The GBM light curve shows a single pulse with a duration (T90) of about 3 seconds (50-300 keV). The time-averaged spectrum from T0-0.26 s to T0+3.07 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.30 +/- 0.11 and the cutoff energy, parameterised as Epeak, is 138 +/- 8 keV. A Band function fits the spectrum equally well with Epeak= 119 +/- 10 keV, alpha = -0.06 +/- 0.2 and beta = -2.7 +/- 0.3. The event fluence (10-1000 keV) in this time interval is 2.6 E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+1.5 seconds in the 10-1000 keV band is 3.7 +/- 0.2 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalogue." --------------------------------------------------------------------------------------------------------------------------------------------- Dr. Oliver J. Roberts BSc PhD Space Science and Advanced Materials Research Group, School of Physics, University College Dublin, Belfield, Dublin 4, Ireland +353(0)1-716-2202