TITLE: GCN CIRCULAR NUMBER: 16743 SUBJECT: GRB 140824B: Fermi GBM Detection DATE: 14/08/25 16:46:21 GMT FROM: Binbin Zhang at UAH Bin-Bin Zhang (UAH) reports on behalf of the Fermi GBM Team: "At 14:33:12.04  UT on the 24th of August 2014, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 140824B (trigger 430583595 / 140824606),  which has been followed up by MASTER II robotic telescope (Tyurina et al.  GCNs 16740, 16741). The GBM on-ground location is consistent with the Fermi  flight software position. The angle from the Fermi LAT boresight is 79 degrees. The GBM light curve consists of three main peaks with a total duration (T90)  of about 109 s (50-300 keV). The time-averaged spectrum from T0+3 s to T0+112 s  is well fit by Band function parameterized as Ep=186+/-20 keV, alpha=-0.9+/-0.1 and beta=-2.5+/-0.5. The event fluence (10-1000 keV) in this time interval is (1.5+/-0.1)E-05 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+111 s in the 10-1000 keV band is  6.9+/-0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."