General information
GRB 260303B is a likely long-duration GRB triggered by Fermi/GBM at 2026-03-03 13:24:20 UT, with additional prompt detections reported by NuSTAR (shields) and AstroSat CZTI.
Wavelength coverage
- Gamma/X-ray (prompt): Fermi/GBM reported the trigger and localization; NuSTAR reported prompt emission in CsI shields; AstroSat CZTI detected the burst in 20–200 keV and faintly in 100–500 keV veto.
- Optical: MASTER-SAAO observed starting ~20 ks after trigger and reported only upper limits (clear band).
No observations were mentioned in radio, infrared, ultraviolet, or TeV bands.
Lightcurve and spectrum
Redshift
What’s special vs typical