General information
GRB 260610A / EP260610a is reported as an Einstein Probe field followed up in the optical, with Fermi GBM also reporting a likely long GRB localization at RA 354.7 deg, Dec 8.4 deg with 10.5 deg statistical uncertainty. The supplied circulars contain optical non-detections and a duplicate GBM localization notice, but no confirmed counterpart or redshift.
Wavelength coverage
- Gamma-ray: Fermi GBM reported detection of a likely long GRB and provided a final real-time localization; the Fermi LAT boresight angle was 102.0 deg.
- X-ray: The optical reports refer to an Einstein Probe FXT source position, but the supplied circulars do not provide the X-ray measurement details.
- Optical: SVOM/VT observed in VT_B and VT_R starting about 1.18 h post trigger and detected no uncatalogued source, with 3-sigma limits VT_B > 23.8 AB and VT_R > 23.4 AB at 2.27 h; COLIBRÍ observed in r and z from 3.78 to 5.32 h post trigger and detected no new source, with 5-sigma limits r > 24.0 AB and z > 22.6 AB.
No observations are mentioned in radio, millimeter, infrared, ultraviolet, neutrino, or gravitational-wave bands.
Lightcurve and spectrum
- Fermi GBM classified the event as a likely long GRB.
- SVOM/VT and COLIBRÍ report only stacked-image optical upper limits, not a detected light curve or spectrum.
Redshift
What’s special vs typical