GCN Circular 23451
E. Bissaldi (Politecnico & INFN Bari) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 08:54:41.73 UT on 25 November 2018, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 181125A (trigger 564828886 / 181125371), which was also detected by the Swift-BAT (Sonbas et al. 2018, GCN 23448). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 64 degrees. The GBM light curve shows a structured emission with a duration (T90) of about 4 s (50-300 keV). The time-averaged spectrum from T0-1.8 s to T0+2 s is adequately fit by a simple power law function with index -1.8 +/- 0.1. The event fluence (10-1000 keV) in this time interval is (4.3 +/- 0.10)E-07 erg/cm^2. The 1-sec peak photon flux measured starting from T0-1.15 s in the 10-1000 keV band is 2.0 +/- 0.2 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."