TITLE:   GCN CIRCULAR
NUMBER:  41881
SUBJECT: GRB 250919A: BALROG localization (Fermi Trigger 779934537 / GRB 250919020)
DATE:    25/09/19 05:41:12 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
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