TITLE: GCN CIRCULAR NUMBER: 34864 SUBJECT: GRB 231020B: BALROG localization (Fermi Trigger 719530557 / GRB 231020900) DATE: 23/10/21 07:02:45 GMT FROM: Jochen Greiner at MPE <jcgrog@mpe.mpg.de> T. Preis, B. Biltzinger, J. Burgess & J. Greiner (all MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 719530557 at 21:35:52 on 20 Oct. 2023 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) = 221.6+/-0.4 deg Decl.(2000.0) = 17.6+/-0.6 deg We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB231020900/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB231020900/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB231020900/json View this GCN Circular online at https://gcn.nasa.gov/circulars/34864. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...