Location of GRB201222461

GRB Properties

Parameters calculated by MPE

Property	Value	Error (1 σ statistical)
Trigger Number
Trigger Time	Dec. 22, 2020, 11:03:25
Data Timestamp	Dec. 22, 2020, 11:09:55
Localization Timestamp	Dec. 22, 2020, 11:42:27
Balrog Ra [deg]	99.7	3.0
Balrog Dec [deg]	27.7	4.7
Error radius 1 σ [deg]	6.4
Error radius 2 σ [deg]	10.2
Estimated systematic error [deg]	1
Fitted Model	cutoff_powerlaw
Spectral Parameter K [photons/cm^2/keV*s]	1.7	0.96
Spectral Parameter Index	-1.2	0.18
Spectral Parameter XC [keV]	6e+02	4e+02
Satellite Phi [deg]	171.46
Satellite Theta [deg]	-16.01

Parameters from external Source

Property	Value
Swift Ra [deg]
Swift Dec [deg]
Most likely	None None%
Second most likely	None None%

GRB Location Alert

GRB 201222B: BALROG localization (Fermi Trigger / GRB 201222461)

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