TITLE: GCN CIRCULAR NUMBER: 43831 SUBJECT: EP260223a: Liverpool Telescope upper limits DATE: 26/02/25 14:09:47 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 EP260223a (Liu et al., GCN 43817) with the 2m Liverpool Telescope on La Palma using the IO:O instrument. We obtained 8x200s exposures in the SDSS r’ and 9x200s exposures in the SDSS z’ filters starting at 2026-02-24 21:07:44 UT, approximately 33.8 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/WXT localisation (Liu et al., GCN 43817), we detect no new sources in our stacked images consistent with the results of Álvarez et al. (GCN 43818) and Zhu et al. (GCN 43826). This is also consistent with the fast fading X-ray emission implied by Liu et al. (GCN 43822). We derive 3-sigma upper limits of r’ > 22.9 and z’ > 22.6 for our stacked images. View this GCN Circular online at https://gcn.nasa.gov/circulars/43831. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...