TITLE: GCN CIRCULAR NUMBER: 45325 SUBJECT: EP260809a: LCO optical observation DATE: 26/08/09 05:04:21 GMT FROM: sqjiang at NAOC <sqjiang@bao.ac.cn> S.Q. Jiang, L.B. He, J. An, X. Liu, Z.P. Zhu, Z. Fan, W.X. Li, D. Xu(NAOC), S.Y. Fu (HUST), Y.L. Hua (PMO) report: We observed the field of EP260809a detected by EP (Sun et al., GCN 45321), using an LCO 1m telescope located at the Teide Observatory (Spain) equipped with the SINISTRO instrument. Observation started at 2026-08-09T03:55:09.359 UT, i.e., 3.27 hr after the trigger, and 3x200 s Sloan r-band frames were obtained. The optical counterpart (Adami et al., GCN 45324) is marginally detected in our stacked image with a brightness of r ~ 22 at a median time of 3.36 hr since trigger, calibrated with Pan-STARRS DR2 stars in the field and not corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/45325. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...