General information
GRB 260221B triggered Fermi/GBM at 23:18:22 UT on 2026-02-21 and is described as a likely short GRB. MASTER-Kislovodsk reported optical follow-up observations starting about 9.8 ks after the trigger with only upper limits.
Wavelength coverage
- Gamma-ray: Fermi GBM trigger and localization reported.
- Optical: MASTER-Kislovodsk (MASTER-Net) clear-filter imaging with non-detection limits.
No X-ray, UV, IR, radio, or spectroscopy observations are mentioned in these circulars.
Lightcurve and spectrum
Redshift
What’s special vs typical