TITLE: GCN CIRCULAR NUMBER: 22328 SUBJECT: GRB 180113A: Fermi GBM observation DATE: 18/01/13 17:45:19 GMT FROM: Peter Veres at UAH P. Veres (UAH) reports on behalf of the Fermi GBM Team: "At 02:47:06.14 UT on 13 January 2018, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 180113A (trigger 537504431 / 180113116). which was also detected by the Swift/BAT (Ukwatta et al., GCN 22325). The GBM on-ground location is consistent with the Swift position. The trigger resulted in an Autonomous Repoint Request (ARR) by the GBM Flight Software owing to the high peak flux of the GRB. This ARR was accepted and the spacecraft slewed to the GBM in-flight location. The initial angle from the Fermi LAT boresight to the best location is 51 degrees. The GBM light curve shows overlapping peaks with a duration (T90) of about 11 s (50-300 keV). The time-averaged spectrum from T0-1.4 s to T0+15.0 s is best fit by a Band function with Epeak = 247 +/- 12 keV, alpha = -0.59 +/- 0.04, and beta = -2.32 +/- 0.10. The event fluence (10-1000 keV) in this time interval is (1.007 +/- 0.012)E-5 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.45 s in the 10-1000 keV band is 9.3 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."