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TITLE:   GCN CIRCULAR
NUMBER:  30952
SUBJECT: GRB 211021A: BALROG localization (Fermi Trigger 656506979 / GRB 211021460)
DATE:    21/10/21 12:02:57 GMT
FROM:    Jochen Greiner at MPE,Garching  <jcg@mpe.mpg.de>

B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:

The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
656506979 at 11:02:54 on 21 Oct. 2021 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 (1 sigma statistical errors) is:
RA(2000.0) = 29.4+/-3.2 deg
Decl.(2000.0) = 27.2+/-2.1 deg
We estimate an additional systematic error of 1 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB211021460/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB211021460/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB211021460/json