TITLE: GCN CIRCULAR NUMBER: 44361 SUBJECT: GRB 260421B: BALROG localization (Fermi Trigger 798437606 / GRB 260421176) DATE: 26/04/21 04:54:24 GMT FROM: Jochen Greiner at MPE <jcgrog@mpe.mpg.de> T. Preis (University of Innsbruck) & J. Greiner (MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 798437606 at 04:13:21 on 21 April 2026 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 is: RA(2000.0) = 190.5 deg Decl.(2000.0) = -16.5 deg The 1 sigma statistical error radius is 2.2 deg. We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB260421176/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB260421176/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB260421176/json View this GCN Circular online at https://gcn.nasa.gov/circulars/44361. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...