GCN Circular 29328
J.Mangan (UCD), R.Dunwoody (UCD), S. Lesage (UAH), C. Meegan (UAH) report on behalf of the Fermi GBM Team: At 02:54:09.82 UT on 19 January 2021, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 210119A (trigger 632717654 / 210119.121), which was also detected by the Swift/BAT (M. J. Moss et al. 2021, GCN 29323). The Fermi GBM Final Real-time Localization (GCN 29322) is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 8 deg degrees. The GBM light curve consists of a short bright burst with a duration (T90) of about 0.05 s (50-300 keV). The time-averaged spectrum from T0-0.064 s to T0+0.064 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.82 +/- 0.18 and the cutoff energy, parameterized as Epeak, is 515 +/- 168 keV. Unlikely to be an SGR given Epeak result. The event fluence (10-1000 keV) in this time interval is (3.432 +/- 0.397)E-7 erg/cm^2. The 64-ms peak photon flux measured starting from T0-0.064 s in the 10-1000 keV band is 11.7 +/- 1.3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.htmlFor Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"