General information
GRB 260516C is a Fermi-GBM triggered event reported as a likely LONG GRB at 2026-05-16 19:34:38 UT, localized to RA=172.6 deg, Dec=-59.9 deg (J2000) with 3.2 deg statistical uncertainty. MASTER-Net (MASTER-SAAO) initiated rapid optical coverage of the GBM error region starting ~63 s after trigger and reported only upper limits.
Wavelength coverage
- Gamma-ray: Fermi Gamma-ray Burst Monitor (GBM) trigger and localization reported.
- Optical: MASTER-SAAO observations starting 63 s after trigger; only upper limits reported.
No X-ray, radio, UV, IR, GeV (LAT detection), neutrino, or gravitational-wave observations are mentioned.
Lightcurve and spectrum
Redshift
What’s special vs typical