General information
EP260901a / GRB 260901A was followed up by SVOM/VT after an EP/WXT detection. The provided circular reports only optical upper limits, with no credible candidate detected within the EP/WXT error box.
Wavelength coverage
- Optical: SVOM/VT observed in VT_B, 400–650 nm, and VT_R, 650–1000 nm, starting 32.628 hr after the trigger; no credible candidate was detected to about 22.5 AB mag in both channels at 33 hr.
- X-ray: EP/WXT is cited as the discovery/detection instrument, but no X-ray measurements are reported in this circular.
- Optical comparison: results are stated to be consistent with MASTER, but no MASTER measurement is given in this circular.
No observations are mentioned in gamma-ray, radio, infrared, ultraviolet, gravitational-wave, or neutrino bands.
Lightcurve and spectrum
- No optical source was detected in stacked SVOM/VT images within the EP/WXT error box.
- 5-sigma upper limits are approximately VT_B >22.5 AB mag and VT_R >22.5 AB mag at a mid-time of 33 hr post-trigger.
Redshift
What’s special vs typical