General information
GRB 260305A was detected by Fermi/GBM at 02:41:38 UT on 2026-03-05 and reported as a likely long GRB with an on-ground real-time localization.
Wavelength coverage
- Gamma-ray: Fermi GBM trigger and localization (RA=216.5 deg, Dec=34.0 deg; 2.4 deg statistical uncertainty).
- Optical: MASTER-SAAO began observations 87 s after trigger and reports only clear-filter upper limits (deepest reported 18.6 mag at T0+272 s).
No observations were mentioned in X-ray, UV, radio, IR, neutrinos, or gravitational waves.
Lightcurve and spectrum
Redshift
What’s special vs typical