TITLE: GCN CIRCULAR NUMBER: 33032 SUBJECT: GRB 221209A: BALROG localization (Fermi Trigger 692257829 / GRB 221209243) DATE: 22/12/09 07:02:34 GMT FROM: Jochen Greiner at MPE,Garching F. Kunzweiler, B. Biltzinger, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 692257829 at 05:50:24 on 09 Dec. 2022 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) = 234.9+/-0.9 deg Decl.(2000.0) = 48.7+/-0.6 deg We estimate an additional systematic error of 2 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB221209243/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB221209243/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB221209243/json