TITLE: GCN CIRCULAR NUMBER: 45516 SUBJECT: GRB260903A: Liverpool Telescope optical observations DATE: 26/09/04 16:39:14 GMT FROM: A. Bochenek at Liverpool John Moores University <a.m.bochenek@2023.ljmu.ac.uk> A. Bochenek, D. A. Perley (LJMU), report: We observed the field of GRB 260903A (Brunet et al., GCN 45499) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 6x120s exposures in SDSS gz filters and 12x120s in the SDSS r filter, starting at 2026-09-04 00:42:48 UT, approximately 12 hours after SVOM/ECLAIRS trigger. The obtained images were stacked after discarding bad quality exposures. We detect a source in the r-band stack at a counterpart position reported by Li et al. (GCN 45504), Saccardi et al. (GCN 45505), Malesani et al. (GCN 45508), Russeil et al. (GCN 45509), Li et al. (GCN 45510), and Moskvitin et al. (GCN 45115). We also report 3-sigma upper limits in other bands. MJD (mid) T_mid-T_0 Filter Mag. (AB) 61287.03369 12.2 h g > 22.37 61287.04889 12.6 h r 22.73 ± 0.26 61287.06252 12.9 h z > 21.38 The photometry is in the AB magnitude system, was calibrated using nearby PanSTARRS secondary standards and was not corrected for extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/45516. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...