TITLE: GCN CIRCULAR NUMBER: 30952 SUBJECT: GRB 211021A: BALROG localization (Fermi Trigger 656506979 / GRB 211021460) DATE: 21/10/21 12:02:57 GMT FROM: Jochen Greiner at MPE,Garching <jcg@mpe.mpg.de> 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 656506979 at 11:02:54 on 21 Oct. 2021 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) = 29.4+/-3.2 deg Decl.(2000.0) = 27.2+/-2.1 deg We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB211021460/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB211021460/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB211021460/json