GCN Circular 22356
M. Stanbro and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 00:36:52.81 UT on 16 January 2018, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 180116A (trigger 537755817 / 180116026) which was also detected by the MAXI/GSC (H. Kawai et al. 2018, GCN 22347). The GBM on-ground location is consistent with the MAXI/GSC position. The angle from the Fermi LAT boresight at the GBM trigger time is 39 degrees. The GBM light curve consists of several episodes with a duration (T90) of about 60 s (50-300 keV). The time-averaged spectrum from T0-3.07 s to T0+58.37 s is best fit by a simple power law function with index -1.72 +/- 0.05. The event fluence (10-1000 keV) in this time interval is (3.54 +/- 0.28)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-1.47 s in the 10-1000 keV band is 1.98 +/- 0.24 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."