TITLE: GCN CIRCULAR NUMBER: 23671 SUBJECT: GRB 190110A: Fermi GBM detection DATE: 19/01/11 05:34:52 GMT FROM: Suraj Poolakkil at UAH S.Poolakkil(UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 17:24:49.21 UT on 10 January 2019, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 190110A(trigger 568833894/ 190110726), which was also detected by the Swift/BAT (Sbarufatti et al. 2019, GCN 23670). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 50 degrees. The GBM light curve consists of a single bright peak with a duration (T90) of about 9 s (50-300 keV). The time-averaged spectrum from T0-2.04 s to T0+10.24 s is best fit by a Band function with Epeak = 73 +/- 8 keV, alpha = -0.44 +/- 0.20 and beta = -2.12 +/- 0.08. The event fluence (10-1000 keV) in this time interval is (5.331 +/- 0.209)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+3.71 s in the 10-1000 keV band is 14.7 +/- 0.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."