TITLE: GCN CIRCULAR NUMBER: 43524 SUBJECT: EP260126a: Liverpool Telescope optical upper limits DATE: 26/01/27 09:58:21 GMT FROM: Rob Eyles-Ferris at U of Leicester <raje1@leicester.ac.uk> R. A. J. Eyles-Ferris and N. Habeeb (Leicester) report on behalf of a larger collaboration: We observed the field of EP260126a (Fu et al., GCN 43520) with the 2m Liverpool Telescope on La Palma using the IO:O instrument. We obtained 6x150s exposures in each of the SDSS i’ and SDSS g’ filters starting at 2026-01-26 23:48:56 UT, approximately 19.4 hours after the X-ray detection. We performed image subtraction on the stacked images using reference images from Pan-STARRS and also compared the stacked and reference images manually. Within the EP/FXT localisation, and across the field, we detect no new sources in either the subtractions or stacked images consistent with the results of Zhu et al. (GCN 43521), Globus et al. (GCN 43522) and Eyles-Ferris et al. (GCN 43523). We derive 3-sigma upper limits of i’ > 23.3 and g’ > 23.0 with photometry calibrated to Pan-STARRS and not corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/43524. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...