TITLE: GCN CIRCULAR NUMBER: 43464 SUBJECT: EP260119a: NOT optical observations DATE: 26/01/20 02:54:49 GMT FROM: liuxing@nao.cas.cn X. Liu, S.Q. Jiang, J. An, L.B. He, Z.P. Zhu, D. Xu (NAOC), S.Y. Fu (HUST), J.P.U. Fynbo (DAWN/NBI), K. Valeckas (NOT) report on behalf of a large collaboration: We observed the field of EP260119a (Jiang et al., GCN43447; Cheng et al., GCN43449) using the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations started at 23:11:51.27 UT on 2026-01-19, i.e., 22.97 hr after the EP trigger, and we obtained 6 x 300 s frames in the Sloan i- and z- bands, respectively . The reported optical counterpart (Fortin et al., GCN43450; GCN 43455; Eyles-Ferris et al., GCN 43454; Moskvitin et al., GCN 43453) was detected in our stacked images in both i- and z- bands. Preliminary photometric results are as follows: T-mid (hr) | Filter | Exposure | Mag 23.80 | i | 6x300s | 21.85 +/- 0.06 23.24 | z | 6x300s | 20.94 +/- 0.08 calibrated with nearby Pan-STARRS1 DR2 stars without the Galactic extinction correction. View this GCN Circular online at https://gcn.nasa.gov/circulars/43464. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...