GCN Circular 23773
E. Bissaldi (Politecnico & INFN Bari) reports on behalf of the Fermi GBM Team: "At 12:19:18.22 UT on 23 January 2019, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 190123A (trigger 569938763 / 190123513), which was also detected by the Swift/BAT (D'Ai et al. 2019, GCN 23769). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 42 degrees. The GBM light curve consists of a multipeaked emission episode with a duration (T90) of about 17 s (50-300 keV). The time-averaged spectrum from T0-5.1 s to T0+10.8 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -0.68 +/- 0.25 and the cutoff energy, parameterized as Epeak, is 310 +/- 100 keV. The event fluence (10-1000 keV) in this time interval is (2.07 +/- 0.04)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+7.1 s in the 10-1000 keV band is 1.8 +/- 0.2 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."