TITLE: GCN CIRCULAR NUMBER: 16220 SUBJECT: GRB 140506A: Fermi GBM Detection DATE: 14/05/07 17:22:01 GMT FROM: Peter Jenke at MSFC P. Jenke (UAH) reports on behalf of the Fermi GBM Team: "At 21:07:36.88 UT on May 6 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140506A (trigger 421103259/140506880), which was also detected by Swift (B.P. Gompertz et al. 2014, GCN 16214). The GBM on-ground location, using the Fermi GBM trigger data, is consistent with the Swift/XRT location. The angle of the burst direction to the Fermi LAT boresight is 135 degrees. The GBM light curve consists of one main peak near T0 and a late, smaller peak at ~T0+60 s with a duration (T90) of about 64 s (50-300 keV). The time-averaged spectrum from T0-1.9 s to T0+2.2s is well fit by a Band function with an Epeak of 141 +/- 36 keV, alpha = -0.9 +/- 0.2 and beta = -2.0 +/- 0.1. The event fluence (10-1000 keV) in this time interval is (3.5 +/- 0.2)E-06 erg/cm^2. The 1.0-sec peak photon flux measured starting from T0 in the 10-1000 keV band is 14.2 +/- 0.7 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."