TITLE: GCN CIRCULAR NUMBER: 14530 SUBJECT: GRB 130502B: Fermi GBM detection of a burst DATE: 13/05/02 20:15:24 GMT FROM: George A. Younes at USRA/NASA/MSFC A. Von Kienlin (MPE) and G. Younes (NASA/USRA) report on behalf of the Fermi GBM Team: "At 07:51:11.76 UT on May 2 2013, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 130502B (trigger 389173874 / 130502327). The on-ground calculated location, using the GBM trigger data, is RA = 74.5, DEC = 70.6 (J2000 degrees), with an uncertainty of 1.0 degree (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 47 degrees. This burst was also independently detected by INTEGRAL SPI-ACS. The GBM light curve consists of multiple spikes with a duration (T90) of about 24 s (50-300 keV). The time-averaged spectrum from T0-4.1 s to T0+71.7 s is best fit by a Band function with Epeak = 323.00 +/- 7.00 keV, alpha = -0.75 +/- 0.01, and beta = -2.47 +/- 0.07. The event fluence (10-1000 keV) in this time interval is (1.21 +/- 0.01)E-04 erg/cm^2. The 1.024 sec peak photon flux measured starting from T0+30.3 s in the 8-1000 keV band is 45.8 +/- 0.5 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog." [GCN OPS NOTE(02may13): The "April" in the first sentence was changed to "May".]