Location of GRB210101620

GRB Properties

Parameters calculated by MPE

Property	Value	Error (1 σ statistical)
Trigger Number	631205591
Trigger Time	Jan. 01, 2021, 14:53:06
Data Timestamp	Jan. 01, 2021, 16:12:11
Localization Timestamp	Jan. 01, 2021, 17:04:34
Balrog Ra [deg]	149.6	3.8
Balrog Dec [deg]	53.1	2.4
Error radius 1 σ [deg]	3.1
Error radius 2 σ [deg]	4.1
Estimated systematic error [deg]	1
Fitted Model	cutoff_powerlaw
Spectral Parameter K [photons/cm^2/keV*s]	23	11
Spectral Parameter Index	-1.7	0.1
Spectral Parameter XC [keV]	6e+03	3e+03
Satellite Phi [deg]	172.40
Satellite Theta [deg]	-65.80

Parameters from external Source

Property	Value
Swift Ra [deg]
Swift Dec [deg]
Most likely	GRB 95.0%
Second most likely	DISTANT_PARTICLES 2.0%

GRB Location Alert

GRB 210101A: BALROG localization (Fermi Trigger 631205591 / GRB 210101620)

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
631205591 at 14:53:06 on 01 Jan. 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) = 149.6+/-3.8 deg
Decl.(2000.0) = 53.1+/-2.4 deg
We estimate an additional systematic error of 1 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB210101620/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB210101620/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB210101620/json