Location of GRB210104477

GRB Properties

Parameters calculated by MPE

Property	Value	Error (1 σ statistical)
Trigger Number	631452424
Trigger Time	Jan. 04, 2021, 11:26:59
Data Timestamp	Jan. 04, 2021, 11:36:17
Localization Timestamp	Jan. 04, 2021, 15:33:29
Balrog Ra [deg]	105.8	4.1
Balrog Dec [deg]	68.7	1.1
Error radius 1 σ [deg]	2.1
Error radius 2 σ [deg]	5.1
Estimated systematic error [deg]	1
Fitted Model	band_function
Spectral Parameter K [photons/cm^2/keV*s]	0.38	0.32
Spectral Parameter Alpha	-0.29	0.41
Spectral Parameter Beta	-1.6	0.02
Spectral Parameter XP	97	28
Satellite Phi [deg]	156.42
Satellite Theta [deg]	-46.95

Parameters from external Source

Property	Value
Swift Ra [deg]	103.70
Swift Dec [deg]	64.66
Most likely	GRB 93.0%
Second most likely	GENERIC_TRANSIENT 4.0%

GRB Location Alert

GRB 210104A: BALROG localization (Fermi Trigger 631452424 / GRB 210104477)

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
631452424 at 11:26:59 on 04 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) = 102.7+/-5.4 deg
Decl.(2000.0) = 69.8+/-1.3 deg
We estimate an additional systematic error of 1 deg.

Further details are available at:
https://grb.mpe.mpg.de/grb/GRB210104477/

The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB210104477/healpix

The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB210104477/json