TITLE: GCN CIRCULAR NUMBER: 26583 SUBJECT: GRB 191225B: BALROG localization (Fermi Trigger 598988276 / GRB 191225735) DATE: 19/12/25 18:02:04 GMT FROM: Jochen Greiner at MPE,Garching B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 598988276 at 17:37:51 on 25 Dec. 2019 were automatically fitted for spectrum and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427; Berlato et al. 2019, ApJ 873, 60). The best-fit position (1 sigma statistical errors) is: RA(2000.0) = 144.1+/-1.7 deg Decl.(2000.0) = -7.2+/-0.8 deg We estimate an additional systematic error of 2 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB191225735/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB191225735/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB191225735/json