GCN Circular 41881
Subject
GRB 250919A: BALROG localization (Fermi Trigger 779934537 / GRB 250919020)
Event
Date
2025-09-19T05:41:12Z (5 days ago)
From
Jochen Greiner at MPE <jcgrog@mpe.mpg.de>
Via
email
T. Preis (University of Innsbruck) & J. Greiner (MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
779934537 at 00:28:52 on 19 Sept. 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) = 300.5 deg
Decl.(2000.0) = -49.1 deg
The 1 sigma statistical error radius is 0.3 deg.
We estimate an additional systematic error of 2 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB250919020/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB250919020/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB250919020/json