TITLE: GCN CIRCULAR NUMBER: 44318 SUBJECT: EP260416a: WFST optical observations and rebrightening DATE: 26/04/17 03:55:29 GMT FROM: ylhua@pmo.ac.cn Yan-Long Hua, Ding-Fang Hu, Jin-Jun Geng, Xue-Feng Wu, Hui Sun, Ye Li, Zhi-Ping Jin, Tian-Rui Sun, Yi-Fang Liang, Yuan-Tai Yang, Ji-An Jiang report on behalf of the WFST team: Following the detection of EP260416a by Einstein Probe (Hu et al., GCN 44307). We performed follow-up observations using the Wide Field Survey Telescope (WFST Collaboration; arXiv:2306.07590) at the Lenghu Astronomical Observation Base in Qinghai Province, China. Observations in the r-band began at 2026-04-16T17:54:47 UTC, approximately 12.4208 hours after the trigger. The optical candidate reported by COLIBRÍ (Ducoin et al., GCN 44310) and SVOM/VT (Li et al., GCN 44315) was clearly detected in images in r band and showed significant rebrightening. The preliminary measurements are given in the AB magnitudes and are not corrected for Galactic extinction: r = 20.27 ± 0.01 (AB) We encourage further follow-up observations. We thank the WFST staff for supporting these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/44318. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...