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GCN Circular 29127

Subject
GRB 201222B: BALROG localization (Fermi Trigger / GRB 201222461)
Date
2020-12-22T11:45:58Z (3 years ago)
From
Jochen Greiner at MPE,Garching <jcg@mpe.mpg.de>
F. Kunzweiler, B. Biltzinger, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:

The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
 at 11:03:25 on 22 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) = 99.7+/-3.0 deg
Decl.(2000.0) = 27.7+/-4.7 deg
We estimate an additional systematic error of 1 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB201222461/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB201222461/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB201222461/json
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