EP260327a

General information

EP260327a is an X-ray transient detected by Einstein Probe/WXT at 2026-03-27 05:54:41 UTC, with an automated EP/FXT follow-up detecting an uncatalogued X-ray source within the WXT error circle.

Wavelength coverage

X-ray: Detected by EP-WXT; refined uncatalogued source detected by EP-FXT within the WXT localization.
Optical: MASTER-OAFA upper limits (clear/unfiltered) starting 510 s after trigger; Gemini-N/GMOS-N deep limits in r’ and z’ at 3.00 hr after trigger.

No observations were mentioned in gamma-ray, UV, IR, radio, sub-mm/mm, or neutrinos.

Lightcurve and spectrum

Redshift

A DESI Legacy Survey object coincident with a subtraction residual inside the EP-FXT localisation is reported with a photometric redshift z_phot = 0.481 ± 0.023, but the Gemini team states the residual is likely a subtraction artefact.

What’s special vs typical

GCN 44170: EP260327a: Xinglong optical upper limit

2026-04-01T04:32:23.684Z | rev 0

GCN 44136: EP260327a: refined analysis of the EP-WXT and autonomous EP-FXT observations

2026-03-28T07:22:27.374Z | rev 0

GCN 44132: EP260327a: WINTER J-band upper limit

2026-03-27T17:20:48.734Z | rev 0

GCN 44131: EP260327a: COLIBRÍ optical upper limits

2026-03-27T17:16:15.183Z | rev 0

GCN 44129: EP260327a: Gemini-North optical upper limits

2026-03-27T13:44:41.142Z | rev 0

GCN 44127: EP260327a: Global MASTER-Net observations report

2026-03-27T08:54:22.110Z | rev 0

GCN 44126: EP260327a: Einstein Probe detection of an X-ray transient

2026-03-27T08:28:31.849Z | rev 0