General information
GRB 260516B was triggered by Fermi/GBM at 05:12:36 UT on 2026-05-16 and reported as a likely long GRB. An on-ground GBM localization was distributed and rapid MASTER-Net optical follow-up reported early non-detections.
Wavelength coverage
- Gamma-ray: Fermi/GBM trigger and localization reported; GBM light curve products provided.
- Optical: MASTER-OAGH clear-band imaging began ~66 s after trigger, reporting multiple upper limits to ~20.0 mag.
No observations were mentioned in X-ray, radio, or infrared.
Lightcurve and spectrum
Redshift
What’s special vs typical