TITLE:   GCN CIRCULAR
NUMBER:  29195
SUBJECT: GRB 201229B: BALROG localization (Fermi Trigger 630948017 / GRB 201229639)
DATE:    20/12/29 15:48:58 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
630948017 at 15:20:12 on 29 Dec. 2020 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) = 341.8+/-2.3 deg
Decl.(2000.0) = -52.8+/-1.3 deg
We estimate an additional systematic error of 2 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB201229639/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB201229639/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB201229639/json