General information
GRB 260225B is reported as a likely long GRB, triggered by Fermi/GBM at 2026-02-25 15:14:07 UT and independently triggered by SVOM/GRM at 2026-02-25T15:14:10 UTC. The GBM on-ground localization is RA=326.4 deg, Dec=0.9 deg (J2000) with 1.8 deg statistical uncertainty.
Wavelength coverage
- Gamma-ray: Detected by Fermi/GBM; SVOM/GRM measured prompt light curve, T90, and spectral parameters.
- Optical/UV: SVOM/ECLAIRs was outside FoV and was not collecting data at trigger time.
No observations were mentioned in X-ray, infrared, or radio.
Lightcurve and spectrum
- SVOM/GRM light curve: precursor followed by a main episode with a single peak; T90 = 49.0 +26.0/-20.0 s (15–5000 keV).
- Time-averaged spectrum (T0-5 to T0+30 s): cutoff power law with index -1.71 +0.17/-0.22 and Epeak = 747 +1525/-389 keV; fluence (10–1000 keV) = (1.48 +0.12/-0.13)E-05 erg/cm^2.
- 1 s peak spectrum (T0+4 to T0+5 s): cutoff power law with index -1.54 +0.16/-0.20 and Epeak = 1390 +1560/-6701 keV; flux (10–1000 keV) = (1.86 +0.14/-0.15)E-06 erg/cm^2/s.
Redshift
What’s special vs typical