TITLE: GCN CIRCULAR NUMBER: 41560 SUBJECT: EP250827a: TRT optical observations DATE: 25/08/27 10:36:23 GMT FROM: J. An <jiean0813@foxmail.com> J. An (NAOC), S. Tinyanont, R. Anutarawiramkul, P. Butpan (NARIT), S.Y. Fu (HUST), L.B. He, X. Liu, Z.P. Zhu, S.Q. Jiang, Z. Fan, W.X. Li, N.C. Sun, Y.N. Wang, D. Xu (NAOC) report on behalf of a large collaboration: We observed the field of EP250827a (Hua et al., GCN 41553), using the 0.7-m telescope of the Thai Robotic Telescope network (TRT), located at Cerro Tololo Inter-American Observatory, Chile. (CTO) Observations started at 08:19:45 UTC on 2025-08-27, i.e., ~ 39 min after the EP/WXT trigger and a series of frames in the r band were obtained. We clearly detect the optical counterpart(Levan et al., GCN 41554; Li et al., GCN 41555; Lipunov et al., GCN 41558; Gritsevich et al., GCN 41559) in our images. Preliminary photometry shows that the source has r ~ 18.93 +/- 0.03 mag at 51.6 min post-trigger, calibrated with Legacy DR10 catalog and not corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/41560. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...