GRB Properties
Parameters calculated by MPE
| Property | Value | Error (1 σ statistical) |
|---|---|---|
| Trigger Number | 783588065 | |
| Trigger Time | Oct. 31, 2025, 07:21:00 | |
| Data Timestamp | Oct. 31, 2025, 09:25:39 | |
| Localization Timestamp | Oct. 31, 2025, 10:24:39 | |
| Balrog Ra [deg] | 188.1 | 1.5 |
| Balrog Dec [deg] | -18.0 | 1.3 |
| Error radius 1 σ [deg] | 2.7 | |
| Error radius 2 σ [deg] | 4.8 | |
| Estimated systematic error [deg] | 1 | |
| Fitted Model | cutoff_powerlaw | |
| Spectral Parameter K [photons/cm^2/keV*s] | 4.1 | 1 |
| Spectral Parameter Index | -1.2 | 0.072 |
| Spectral Parameter XC [keV] | 1e+02 | 2e+01 |
| Satellite Phi [deg] | 33.89 | |
| Satellite Theta [deg] | 41.68 |
Parameters from external Source
| Property | Value |
|---|---|
| Swift Ra [deg] | |
| Swift Dec [deg] | |
| Most likely | GRB 91.0% |
| Second most likely | SOLAR_FLARE 6.0% |
GRB Location Alert
To circulars@gcn.nasa.gov
GRB 251031A: BALROG localization (Fermi Trigger 783588065 / GRB 251031306)
T. Preis (University of Innsbruck) & J. Greiner (MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
783588065 at 07:21:00 on 31 Oct. 2025 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 is:
RA(2000.0) = 188.3 deg
Decl.(2000.0) = -17.9 deg
The 1 sigma statistical error radius is 2.8 deg.
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB251031306/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB251031306/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB251031306/json
GRB 251031A: BALROG localization (Fermi Trigger 783588065 / GRB 251031306)
T. Preis (University of Innsbruck) & J. Greiner (MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
783588065 at 07:21:00 on 31 Oct. 2025 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 is:
RA(2000.0) = 188.3 deg
Decl.(2000.0) = -17.9 deg
The 1 sigma statistical error radius is 2.8 deg.
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB251031306/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB251031306/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB251031306/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
