TITLE: GCN CIRCULAR NUMBER: 43790 SUBJECT: The EP-WXT trigger 01709258519 is likely caused by Mrk 421 DATE: 26/02/21 10:01:16 GMT FROM: EP Team at NAOC/CAS <ep_ta@bao.ac.cn> M.-H. Zhang, X. X. Sun, Tian-Yu Liu, Y. Liu (NAO, CAS) on behalf of the Einstein Probe (EP) team: The EP-WXT trigger 01709258519 at the time of 2026-02-21T08:28:55 is likely associated with the known source Mrk 421. 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). View this GCN Circular online at https://gcn.nasa.gov/circulars/43790. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...