TITLE: GCN CIRCULAR NUMBER: 43875 SUBJECT: EP260227a: Liverpool Telescope observations DATE: 26/02/28 10:29:52 GMT FROM: Rob Eyles-Ferris at U of Leicester <raje1@leicester.ac.uk> R. A. J. Eyles-Ferris and N. R. Tanvir (Leicester) report on behalf of a larger collaboration: We observed the field of EP260227a (Wang et al., GCN 43869) with the 2m Liverpool Telescope on La Palma using the IO:O instrument. We obtained 6x150s exposures in each of the SDSS g’ r’ i’ z’ filters starting at 2026-02-28 04:25:03 UT, approximately 8.21 hours after the X-ray detection. We detect the optical counterpart (Eyles-Ferris et al., GCN 43867; Li et al., GCN 43868; Fu et al., GCN 43873; Mandarakas et al., GCN 43874) in the r’, i’ and z’ bands. We measure the following magnitudes calibrated to Pan-STARRS and not corrected for Galactic extinction. | t_mid (hours) | Filter | AB magnitude | | ------------- | ------ | ---------------- | | 8.35 | g’ | >22.28 (3-sigma) | | 8.63 | i’ | 21.12 +/- 0.08 | | 8.92 | r’ | 21.61 +/- 0.22 | | 9.21 | z’ | 20.74 +/- 0.11 | Compared to the photometry tabulated by Fu et al. (GCN 43873) and Mandarakas et al. (GCN 43874), our observations suggest the source has not faded significantly between these three epochs. View this GCN Circular online at https://gcn.nasa.gov/circulars/43875. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...