//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 16742 SUBJECT: GRB 140821A: Fermi GBM Detection DATE: 14/08/25 16:44:54 GMT FROM: Binbin Zhang at UAH Bin-Bin Zhang (UAH) reports on behalf of the Fermi GBM Team: "At 23:56:02.84  UT on the 21st of August 2014, the Fermi Gamma-Ray Burst  Monitor triggered and located GRB 140821A (trigger 430358165 / 140821997).  The trigger resulted in an Autonomous Repoint Request (ARR) that was  accepted. The GBM on-ground location is consistent with the Fermi flight  software position. The angle from the Fermi LAT boresight is 93 degrees. The GBM light curve consists of single peak with a duration (T90) of about 32 s (50-300 keV). The time-averaged spectrum from T0+11 s to T0+43 s is well fit by Band function parameterized as Ep=483+/-22 keV,  alpha=-0.82+/-0.03 and beta=-2.4+/-0.1.  The event fluence (10-1000 keV) in this time interval is (6.314+/-0.067)E-05 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+29 s in the 10-1000 keV band is  19.5+/-0.6 ph/s/cm^2. The burst spectrum may be contaminated by solar flare activity that is  detected at energies below ~20 keV in many of the same GBM detectors.  Although the solar emission has several peaks, the first of which is   around T0+130 s, it may have significant overlap with the time of the burst. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog.”