TITLE: GCN CIRCULAR NUMBER: 14442 SUBJECT: GRB 130425A: Fermi GBM detection DATE: 13/04/25 15:24:49 GMT FROM: Andreas von Kienlin at MPE A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team: "At 07:51:16.23 UT on 25 April 2013, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 130425A (trigger 388569079 / 130425327). The on-ground calculated location, using the GBM trigger data, is RA = 19.0, DEC = -72.2 (J2000 degrees, equivalent to 01 h 16 m, -72 d 12 '), with an uncertainty of 2.9 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which is currently estimated to be 2 to 3 degrees). The angle from the Fermi LAT boresight is 150 degrees. The GBM light curve shows two peaks with a duration (T90) of about 66 s (50-300 keV). The time-averaged spectrum from T0-2.880 s to T0+69.825 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.28 +/- 0.03 and the cutoff energy, parameterized as Epeak, is 254 (+14/-13) keV. The event fluence (10-1000 keV) in this time interval is (5.2 +/- 0.1)E-05 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+43.5207 s in the 10-1000 keV band is 21.8 +/- 1.1 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."