GCN Circular 45148
Subject
EP260711a: EP-FXT follow-up observation
Event
Date
2026-07-13T14:15:55Z (6 days ago)
From
EP Team at NAOC/CAS <ep_ta@bao.ac.cn>
Via
Web form
Y.Wu (NJU), G. Y. Zhao (SYSU), Z.-Y. Jian (THU), and H. Sun (NAO, CAS) on behalf of the Einstein Probe (EP) team:
We performed a follow-up observation of EP260711a (GCN 45139) with EP-FXT. The observation started at 2026-07-12 07:29:45 (UTC), about 22 hr after the EP-WXT detection, with a total exposure time of around 4.4 ks. No bright X-ray source was found in one FXT module observation. A weak uncatalogued source, with SNR of 3.2, was found within the WXT error circle after stacking the FXT A and FXT B data. The position of the source is at R.A., Dec. = 213.2229, -58.8956 deg (J2000) with an uncertainty of 10 arcsec (radius, 90% C.L. statistical and systematic). The average unabsorbed flux is around 3 x 10^(-14) erg/s/cm^2 in the 0.5-10 keV energy band. It is still unclear if the FXT detection is associated with EP260711a.
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).