TITLE: GCN CIRCULAR NUMBER: 45285 SUBJECT: AT 2026wki: EP/FXT follow-up observations DATE: 26/08/04 12:56:36 GMT FROM: Rui-Zhi Li at Yunnan Observatories, CAS <liruizhi@ynao.ac.cn> R.-Z. Li (YNAO, CAS), J. Mao (YNAO, CAS), M. Pillas (IAP), S. Antier (IJCLAB), D. Akl (NYUAD) report on behalf of a larger collaboration: We report one EP/FXT Target of Opportunity (ToO) observation of the optical transient AT 2026wki. The EP/FXT follow-up observation started at 2026-08-01T21:06:21 (UTC), approximately 3.64 days after the first detection of the transient, with a total exposure time of 4.8 ks. No X-ray source was detected at the position of AT 2026wki within the 10 arcsec error radius (90% C.L. statistical and systematic). The estimated flux upper limit is 5.59 x 10^-14 erg/cm^2/s in the 0.5-10 keV band (90% C.L.). View this GCN Circular online at https://gcn.nasa.gov/circulars/45285. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...