General information
GRB 260628A was detected by Fermi GBM at 2026-06-28 21:51:24 UT and reported as a likely short GRB. The on-ground GBM position is RA 308.2 deg, Dec -6.9 deg, with a statistical uncertainty of 14.3 deg.
Wavelength coverage
- Gamma-ray: Fermi GBM triggered and localized the event; the angle from the Fermi LAT boresight was reported as 63.0 deg.
- Optical: MASTER-OAGH observed the Fermi GBM error box starting about 19,564 s after trigger and reported clear-band upper limits up to 15.9 mag.
No observations are mentioned in radio, X-ray, infrared, ultraviolet, neutrino, or gravitational-wave bands.
Lightcurve and spectrum
- Fermi GBM reports a likely short GRB trigger at 21:51:24 UT.
- MASTER-OAGH clear-filter 60 s exposures at Tmid-T0 approximately 19,595–20,137 s gave upper limits from 14.5 to 15.9 mag.
Redshift
What’s special vs typical
- The event is reported as a likely short GRB, which is potentially more follow-up-relevant than a routine long GRB, but no counterpart or distance information is reported in the provided circulars.