TITLE: GCN CIRCULAR NUMBER: 28402 SUBJECT: GRB 200909A: BALROG localization (Fermi Trigger 621316887 / GRB 200909168) DATE: 20/09/09 04:21:57 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 621316887 at 04:01:22 on 09 Sept. 2020 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) = 342.2+/-2.1 deg Decl.(2000.0) = -17.8+/-2.6 deg We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB200909168/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB200909168/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB200909168/json