GRB Properties
Parameters calculated by MPE
| Property | Value | Error (1 σ statistical) |
|---|---|---|
| Trigger Number | ||
| Trigger Time | Aug. 21, 2025, 16:07:47 | |
| Data Timestamp | Aug. 21, 2025, 16:43:55 | |
| Localization Timestamp | Aug. 21, 2025, 19:47:37 | |
| Balrog Ra [deg] | 60.0 | 11.2 |
| Balrog Dec [deg] | -84.7 | 0.6 |
| Error radius 1 σ [deg] | 2.0 | |
| Error radius 2 σ [deg] | 3.2 | |
| Estimated systematic error [deg] | 2 | |
| Fitted Model | cutoff_powerlaw | |
| Spectral Parameter K [photons/cm^2/keV*s] | 10 | 1 |
| Spectral Parameter Index | -0.99 | 0.027 |
| Spectral Parameter XC [keV] | 4e+02 | 3e+01 |
| Satellite Phi [deg] | 94.80 | |
| Satellite Theta [deg] | 28.74 |
Parameters from external Source
| Property | Value |
|---|---|
| Swift Ra [deg] | |
| Swift Dec [deg] | |
| Most likely | None None% |
| Second most likely | None None% |
GRB Location Alert
To circulars@gcn.nasa.gov
GRB 250821B: BALROG localization (Fermi Trigger / GRB 250821672)
T. Preis (University of Innsbruck) & J. Greiner (MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
at 16:07:47 on 21 Aug. 2025 were manually 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 is:
RA(2000.0) = 60.0 deg
Decl.(2000.0) = -84.7 deg
The 1 sigma statistical error radius is 2.0 deg.
We estimate an additional systematic error of 2 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB250821672/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB250821672/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB250821672/json
GRB 250821B: BALROG localization (Fermi Trigger / GRB 250821672)
T. Preis (University of Innsbruck) & J. Greiner (MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
at 16:07:47 on 21 Aug. 2025 were manually 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 is:
RA(2000.0) = 60.0 deg
Decl.(2000.0) = -84.7 deg
The 1 sigma statistical error radius is 2.0 deg.
We estimate an additional systematic error of 2 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB250821672/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB250821672/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB250821672/json
GRB Location
J2000 Coordinate Frame
All Corner Plot
J2000 Coordinate Frame
Moll Location Plot
J2000 Coordinate Frame
Satellite
Spectrum Residuals Plot
3D - GRB Location Plot
Satellite Coordiante Frame
Light Curves
