TITLE: GCN CIRCULAR NUMBER: 40706 SUBJECT: GRB 250612C: BALROG localization (Fermi Trigger 771432801 / GRB 250612620) DATE: 25/06/12 15:19:24 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 771432801 at 14:53:16 on 12 June 2025 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) = 118.9 deg Decl.(2000.0) = 18.8 deg The 1 sigma statistical error radius is 1.1 deg. We estimate an additional systematic error of 1 deg.

Further details are available at: https://grb.mpe.mpg.de/grb/GRB250612620/

The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB250612620/healpix

The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB250612620/json

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