TITLE: GCN CIRCULAR NUMBER: 38888 SUBJECT: EP250108a: EP-FXT follow-up observation DATE: 25/01/10 07:45:32 GMT FROM: EP Team at NAOC/CAS ep_ta@bao.ac.cn

R.-Z. Li (YNAO, CAS), X.-L. Chen (YNU), K. Chatterjee (YNU), Y.-L. Hua (PMO) and Y. Liu (NAOC) report on behalf of the Einstein Probe team:

We performed a follow-up observation of EP250108a using the FXT onboard the EP. The observation began at 2025-01-09T10:42:46 (UTC, about 22.2 hours post-trigger), with an exposure time of about 6 ks. No new uncatalogued X-ray sources were detected within the EP-WXT error circle (GCN 38861). The 5-sigma upper limit flux is about 3 x 10^-14 erg/s/cm^2 in the 0.5–10 keV range.

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

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