General information
GRB 260504A was detected by Fermi/GBM at 2026-05-04 09:12:58 UT and reported as a likely long GRB, with an on-ground real-time localization centered at RA=308.8 deg, Dec=48.4 deg (J2000) and a stated statistical uncertainty of 5.0 deg.
Wavelength coverage
- Gamma-ray: Detection and localization by Fermi Gamma-ray Burst Monitor (GBM).
- Optical: MASTER-OAFA (MASTER-Net) imaged part of the GBM error box starting 612 s after trigger, reporting only upper limits in clear (C) band.
No observations were mentioned in X-ray, UV, IR, radio, GeV (LAT detection), neutrinos, or gravitational waves.
Lightcurve and spectrum
Redshift
What’s special vs typical