TITLE: GCN CIRCULAR NUMBER: 17249 SUBJECT: GRB 141229A: Fermi GBM detection DATE: 14/12/29 18:58:55 GMT FROM: Oliver Roberts at UCD/Fermi O.J. Roberts (UCD) reports on behalf of the Fermi GBM Team: "At 11:48:59.84 UT on the 29th of December 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 141229A (trigger 441546542 / 141229492 ). The GBM on-ground location, using the Fermi GBM trigger data, is consistent with the MAXI/GSC position (Negoro et al. 2014, GCN 17246). The angle from the Fermi LAT boresight is about 104 degrees. The GBM light curve consists of a single FRED-like peak with a duration (T90) of about 11 seconds (50-300 keV). The time- averaged spectrum from T0+0.0 to T0+11 seconds is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -0.91 +/- 0.08 and the cutoff energy, parameterized as Epeak, is 275 +/- 31 keV. The event fluence (10-1000 keV) in this time interval is (5.1 +/- 0.4)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-0.1 s in the 10-1000 keV band is 8.9 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."