TITLE:   GCN CIRCULAR
NUMBER:  44613
SUBJECT: EP260514a: Einstein Probe detection of a fast X-ray transient
DATE:    26/05/15 03:20:32 GMT
FROM:    EP Team at NAOC/CAS <ep_ta@bao.ac.cn>

Y.-H. Cheng (SWIFAR, YNU), K.R. Ni (CCNU), R.-Z. Li (YNAO, CAS) and W.-D. Zhang (NAO, CAS) on behalf of the Einstein Probe (EP) team:

We report on the detection of a fast X-ray transient by the Wide-field X-ray Telescope (WXT) on board the Einstein Probe (EP) mission, designated EP260514a. The ground analysis of the WXT data shows that the event started at T0 = 2026-05-14T16:56:06 (UTC) and lasted for around 500 s. The WXT position of the source is R.A. = 214.297 deg, DEC = 49.365 deg (J2000) with an uncertainty of 3 arcmin in radius (90% C.L. statistical and systematic).

A follow-up observation with the Follow-up X-ray Telescope (FXT) on board EP has been scheduled. Further information will be updated when the telemetry data is received.

Launched on January 9, 2024, EP is a space X-ray observatory to monitor the soft X-ray sky with X-ray follow-up capability (Yuan et al. 2022, Handbook of X-ray and Gamma-ray Astrophysics).