TITLE: GCN CIRCULAR NUMBER: 39529 SUBJECT: EP250225a: EP-FXT follow-up observation DATE: 25/02/28 14:11:40 GMT FROM: EP Team at NAOC/CAS ep_ta@bao.ac.cn
S. Q. Jiang, T. Zhao (NAO, CAS), B.-T. Wang (YNAO, CAS), H. Z. Wu (HUST), Y. J. Song, Y. Liu (NAO, CAS) report on behalf of the Einstein Probe team:
We performed one follow-up observation of the X-ray transient EP250225a (Jiang et al., GCN 39475) with the Follow-up X-ray Telescope (FXT) on board the Einstein Probe (EP) mission. The observation started at 2025-02-26 11:53:56 (UTC), about 23.67 hours after the WXT detection, with an exposure of ~3 ks. No source was detected within the WXT error circle. The 0.5-10 keV upper limit at the NOT candidate position (Malesani et al., GCN 39516) is about 7e-14 erg/s/cm^2 (90% C. L.).
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).
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