TITLE: GCN CIRCULAR NUMBER: 44639 SUBJECT: EP260514a: TRT optical counterpart candidate DATE: 26/05/16 07:39:15 GMT FROM: liuxing@nao.cas.cn X. Liu, (NAOC), S. Tinyanont, R. Anutarawiramkul, P. Butpan, K. Noysena, K. Chanchaiworawit (NARIT), S.Q. Jiang, J. An, Z.P. Zhu, L.B. He, D. Xu, Z. Fan, W.X. Li, N.C. Sun (NAOC), S.Y. Fu (HUST) report: We observed the field of EP260514a dtected by EP/WXT (Cheng et al., GCN 44613), using the 0.7-m telescope of the Thai Robotic Telescope network (TRT), located at Fresno, California, U.S.A (SRO). Observation started at 2026-05-15 04:25:07 UT, i.e., 0.48 day post-burst, and 6x300 s R-band frames were obtained. Image subtraction using Legacy-DR10 reveals an uncatalogued optical source within the EP/WXT (Cheng et al., GCN 44613) error circle at coordinates R.A. (J2000) = 14:17:10.41 Dec. (J2000) = +49:22:30.9 with an uncertainty of ~ 1.5 arcsec. The source had R ~ 21.8 mag with SNR of ~3 at a median time of 11.74 hrs post-trigger, calibrated with Pan-STARRS DR2 converted using Lupton (2005) equations and not corrected for Galactic extinction. No NEO would be at the above position at the observational time by checking MPC. We think the source could be the optical cointerpart of EP260514a. View this GCN Circular online at https://gcn.nasa.gov/circulars/44639. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...