General information
GRB 260503A is a likely long GRB detected by Fermi/GBM at 2026-05-03 20:40:17 UT and independently observed by SVOM/GRM and GECAM-B around the same epoch. The reported GBM localization is RA=287.1 deg, Dec=-2.0 deg with 2.6 deg statistical uncertainty.
Wavelength coverage
- Gamma-rays / hard X-rays: Fermi/GBM trigger and localization; SVOM/GRM prompt lightcurve and spectrum; GECAM-B prompt lightcurves and duration.
- High-energy gamma-rays: Fermi/LAT boresight angle reported (30 deg), but no LAT detection claim stated.
- Optical/soft X-rays/radio: SVOM/ECLAIRs did not observe the burst (outside FoV).
No observations are mentioned in soft X-rays, UV/optical/NIR, sub-mm, or radio.
Lightcurve and spectrum
Redshift
What’s special vs typical