GRB Properties
Parameters calculated by MPE
| Property | Value | Error (1 σ statistical) |
|---|---|---|
| Trigger Number | 798437606 | |
| Trigger Time | April 21, 2026, 04:13:21 | |
| Data Timestamp | April 21, 2026, 07:25:51 | |
| Localization Timestamp | April 21, 2026, 07:37:05 | |
| Balrog Ra [deg] | 190.6 | 1.2 |
| Balrog Dec [deg] | -16.6 | 1.2 |
| Error radius 1 σ [deg] | 1.9 | |
| Error radius 2 σ [deg] | 3.4 | |
| Estimated systematic error [deg] | 1 | |
| Fitted Model | cutoff_powerlaw | |
| Spectral Parameter K [photons/cm^2/keV*s] | 7.1 | 2 |
| Spectral Parameter Index | -1.3 | 0.08 |
| Spectral Parameter XC [keV] | 2e+02 | 6e+01 |
| Satellite Phi [deg] | -160.92 | |
| Satellite Theta [deg] | 30.44 |
Parameters from external Source
| Property | Value |
|---|---|
| Swift Ra [deg] | |
| Swift Dec [deg] | |
| Most likely | GRB 98.0% |
| Second most likely | GENERIC_TRANSIENT 1.0% |
GRB Location Alert
To circulars@gcn.nasa.gov
GRB 260421B: BALROG localization (Fermi Trigger 798437606 / GRB 260421176)
T. Preis (University of Innsbruck) & J. Greiner (MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
798437606 at 04:13:21 on 21 April 2026 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) = 190.5 deg
Decl.(2000.0) = -16.5 deg
The 1 sigma statistical error radius is 2.2 deg.
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB260421176/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB260421176/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB260421176/json
GRB 260421B: BALROG localization (Fermi Trigger 798437606 / GRB 260421176)
T. Preis (University of Innsbruck) & J. Greiner (MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
798437606 at 04:13:21 on 21 April 2026 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) = 190.5 deg
Decl.(2000.0) = -16.5 deg
The 1 sigma statistical error radius is 2.2 deg.
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB260421176/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB260421176/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB260421176/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
