EP260314a

General information

EP260314a is an Einstein Probe fast X-ray transient detected by EP/WXT on 2026-03-14 22:51:36 UTC, with an automatically triggered EP/FXT follow-up finding an uncatalogued X-ray source consistent with the WXT localization.

Wavelength coverage

• X-ray: EP/WXT trigger and EP/FXT follow-up with refined position and spectral fits/fluxes.
• Optical/NIR: SVOM/VT reports an uncatalogued VT_R source within the EP/FXT error circle; multiple facilities report upper limits (MASTER, BOOTES-6, COLIBRÍ i/z, LOT r, Xinglong clear/g-calibrated).
• Gamma-ray: no observations mentioned.
• Radio: no observations mentioned.
• UV: no observations mentioned.

Lightcurve and spectrum

• EP/WXT: 16 s observation; absorbed power-law fit with NH=0.54(-0.27/+0.32)×10^22 cm^-2, photon index 1.81(-0.75/+0.83), unabsorbed flux (0.5–4 keV) 2.14(-0.55/+1.13)×10^-8 erg/s/cm^2.
• EP/FXT: started at T0+211 s with 2.9 ks exposure; absorbed power-law fit with NH=0.22(-0.07/+0.07)×10^22 cm^-2, photon index 2.21(-0.27/+0.28), unabsorbed flux (0.5–10 keV) 5.11(+0.46/-0.41)×10^-12 erg/s/cm^2.
• SVOM/VT photometry at 1.07 hr: VT_R=22.70±0.26 AB; VT_B > 23.0 AB.
• Optical limits: BOOTES-6 clear >21.7 (tens of minutes); MASTER limits to 20.4 (hours); COLIBRÍ i>24.08, z>23.17 (9.1–12.4 hr); LOT r>22.8 (17.5 hr); Xinglong g21.5 (19.1 hr).

Redshift

What’s special vs typical