This is the Analysis page for GRB210801581: GRB210801581

Version History of Data Files: v00

GRB Properties

Parameters calculated by MPE

Property Value Error (1 σ statistical)
Trigger Number 649519043
Trigger Time Aug. 01, 2021, 13:57:18
Data Timestamp Aug. 01, 2021, 16:04:18
Localization Timestamp Aug. 01, 2021, 16:12:05
Balrog Ra [deg] 238.2 1.5
Balrog Dec [deg] -40.8 0.9
Error radius 1 σ [deg] 2.3
Error radius 2 σ [deg] 3.2
Estimated systematic error [deg] 2
Fitted Model cutoff_powerlaw
Spectral Parameter K [photons/cm^2/keV*s] 4.8e+02 46
Spectral Parameter Index -2.1 0.035
Spectral Parameter XC [keV] 3e+02 4e+01
Satellite Phi [deg] 110.91
Satellite Theta [deg] -24.77

Parameters from external Source

Property Value
Swift Ra [deg]
Swift Dec [deg]
Most likely GRB 82.0%
Second most likely GENERIC_SGR 13.0%

GRB Location Alert

GRB 210801A: BALROG localization (Fermi Trigger 649519043 / GRB 210801581)

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
649519043 at 13:57:18 on 01 Aug. 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) = 238.2+/-1.5 deg
Decl.(2000.0) = -40.8+/-0.9 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