TITLE:   GCN CIRCULAR
NUMBER:  27548
SUBJECT: GRB 200412B: BALROG localization (Fermi Trigger 608375325 / GRB 200412381)
DATE:    20/04/12 09:45:13 GMT
FROM:    Jochen Greiner at MPE,Garching  <jcg@mpe.mpg.de>

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

We note that the spectral fit from the automated pipeline appears off due to more high-energy emission than normal. We are re-running the pipeline manually to test this hypothesis. This position may be updated. 

The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
608375325 at 09:08:40 on 12 April 2020 were automatically fitted for spectrum
and sky location with the official 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) = 271.0+/-1.1 deg
Decl.(2000.0) = 64.4+/-0.3 deg
We estimate an additional systematic error of 1 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB200412381/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB200412381/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB200412381/json