GCN Circular 40539
Subject
GRB 250523A: BALROG localization (Fermi Trigger 769703188 / GRB 250523602)
Date
2025-05-23T14:53:57Z (16 hours 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
769703188 at 14:26:23 on 23 May 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) = 64.4 deg
Decl.(2000.0) = 53.7 deg
The 1 sigma statistical error radius is 2.9 deg.
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB250523602/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB250523602/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB250523602/json