This is the Analysis page for GRB201229639: GRB201229639

Version History of Data Files: v01 v00 tte_v00

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:

The Healpix map can be downloaded from:

The location parameters are available as JSON at:

GRB Location

J2000 Coordinate Frame

All Corner Plot

J2000 Coordinate Frame

Moll Location Plot

J2000 Coordinate Frame


Spectrum Residuals Plot

3D - GRB Location Plot

Satellite Coordiante Frame

Light Curves

Lightcurve detector b0
Lightcurve detector b1
Lightcurve detector n0
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Lightcurve detector n9
Lightcurve detector na
Lightcurve detector nb