EP260514a

General information

EP260514a is a fast X-ray transient detected by Einstein Probe/WXT at 2026-05-14 16:56:06 UTC with a reported duration of ~500 s, followed by EP/FXT and extensive optical follow-up. A fading optical source consistent with being the counterpart was reported by TRT and later detected by NOT.

Wavelength coverage

X-ray: EP/WXT detection with spectral fit and flux; EP/FXT follow-up detection with position refinement, spectrum, and flux.
Optical: MASTER (clear-band) upper limits; GIT r' upper limit; COLIBRÍ r and z upper limits; TRT reports an uncatalogued optical candidate; NOT detects the candidate later at fainter magnitude. No observations were mentioned in gamma-rays, UV, infrared, radio, gravitational waves, or neutrinos.

Lightcurve and spectrum

Redshift

What’s special vs typical

GCN 44641: EP260514a: refined analysis of the EP-WXT and follow-up EP-FXT observations

2026-05-16T08:08:24.554Z | rev 0

GCN 44640: EP260514a: NOT optical counterpart confirmation

2026-05-16T07:51:09.298Z | rev 0

GCN 44639: EP260514a: TRT optical counterpart candidate

2026-05-16T07:39:15.215Z | rev 0

GCN 44639: EP260514a: TRT optical counterpart candidate

2026-05-16T07:39:15.215Z | rev 2

GCN 44632: EP260514a: COLIBRÍ optical upper limits

2026-05-16T03:23:14.544Z | rev 0

GCN 44619: EP260514a: GROWTH-India Telescope optical upper limit

2026-05-15T17:20:18.943Z | rev 0

GCN 44614: EP260514a: Global MASTER-Net observations report

2026-05-15T03:27:20.593Z | rev 0

GCN 44613: EP260514a: Einstein Probe detection of a fast X-ray transient

2026-05-15T03:20:32.465Z | rev 0