TITLE: GCN CIRCULAR NUMBER: 43754 SUBJECT: EP260214a: NOT optical upper limits DATE: 26/02/15 15:07:18 GMT FROM: L. B. He at NAOC <helb@bao.ac.cn> L.B. He (NAOC), S.Y. Fu (HUST), J. An, X. Liu, S.Q. Jiang, Z.P. Zhu, D. Xu (NAOC), J.P.U. Fynbo (DAWN/NBI), K. Valeckas (NOT) report on behalf of a large collaboration: We observed the field of EP260214a (Li et al., GCN 43742) using the 2.56-m Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations started at 03:39:29.978 UT on 2026-02-15, i.e., 7.02 hrs after the EP trigger, and we obtained 3x300 s frames in the Sloan r-band and 5 x 200 s frames in the Sloan z- band. No new optical source is detected within the EP/FXT error circle (Li et al., GCN 43751), down to 5-sigma upper limits of r ~ 23.1 and z ~ 21.8, calibrated with nearby Pan-STARRS stars and not corrected for Galactic extinction. These upper limits are consistent with the ones previously reported (Li et al., GCN 43746; Watson et al. GCN 43753). View this GCN Circular online at https://gcn.nasa.gov/circulars/43754. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...