Location of GRB201229639

GRB Properties

Parameters calculated by MPE

Property	Value	Error (1 σ statistical)
Trigger Number	630948017
Trigger Time	Dec. 29, 2020, 15:20:12
Data Timestamp	Dec. 29, 2020, 16:41:13
Localization Timestamp	Dec. 29, 2020, 17:47:12
Balrog Ra [deg]	342.4	2.7
Balrog Dec [deg]	-52.7	1.2
Error radius 1 σ [deg]	1.9
Error radius 2 σ [deg]	3.3
Estimated systematic error [deg]	2
Fitted Model	cutoff_powerlaw
Spectral Parameter K [photons/cm^2/keV*s]	2.7	0.43
Spectral Parameter Index	-1.2	0.047
Spectral Parameter XC [keV]	5e+02	9e+01
Satellite Phi [deg]	54.76
Satellite Theta [deg]	62.49

Parameters from external Source

Property	Value
Swift Ra [deg]
Swift Dec [deg]
Most likely	GRB 97.0%
Second most likely	GENERIC_TRANSIENT 2.0%

GRB Location Alert

GRB 201229B: BALROG localization (Fermi Trigger 630948017 / GRB 201229639)

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