TITLE: GCN CIRCULAR NUMBER: 39704 SUBJECT: GRB 250313A???: BALROG localization (Fermi Trigger / GRB 250313607) DATE: 25/03/13 16:04:30 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 at 14:34:33 on 13 March 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) = 274.6 deg Decl.(2000.0) = 45.3 deg The 1 sigma statistical error radius is 0.1 deg. We estimate an additional systematic error of 2 deg.

Further details are available at: https://grb.mpe.mpg.de/grb/GRB250313607/

The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB250313607/healpix

The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB250313607/json

View this GCN Circular online at https://gcn.nasa.gov/circulars/39704. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...