GCN Circular 45533
Subject
The EP-WXT trigger 01709306297 is likely the known LMXB 4U 1745-203
Date
2026-09-09T01:55:23Z (6 days ago)
From
EP Team at NAOC/CAS <ep_ta@bao.ac.cn>
Via
Web form
Y. F. Liang (PMO), H. R. Ren (NAOC), J. Y. Liu (PMO), A. D. Zhu (HUST), M. Y. Wang (XMU) , M. Nie (YNAO), H. H. Zhang (NJU), L.N. Xu(USTC), Y. Liu (NAOC) on behalf of the Einstein Probe (EP) team:
The EP-WXT trigger 01709306297 occurred at 026-09-08T14:20:17. The follow-up FXT observations yield a triggered position at R.A. = 267.2170 deg, Dec = -20.3588 deg (J2000) with a 10 arcsec radius uncertainty. This event is likely a detection of 4U 1745-203 (identical to SAX J1748.9-2021; ATel #18011). The estimated flux from the observation is approximately 5.22e-9 erg/s/cm^2 in 0.5-10.0 keV.
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).