TITLE:   GCN CIRCULAR
NUMBER:  41723
SUBJECT: GRB250904A: Liverpool Telescope upper limits
DATE:    25/09/05 11:14:38 GMT
FROM:    A. Bochenek at Liverpool John Moores University <a.m.bochenek@2023.ljmu.ac.uk>

A. Bochenek and D. A. Perley (LJMU) report:
 
We observed the field of GRB250904A (Salvaggio et al., GCN 41704) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 4x120s exposures in the SDSS i’ filter starting at 2025-09-05 05:47:54 UT, approximately 12.2 hours after the trigger.

We do not detect the reported optical counterpart (Fu et al., GCN 41709; Oates et al., GCN 41721) or any new source near the XRT position (Evans et al., GCN 41706; Goad et al., GCN 41711). The 3-sigma limiting magnitude on the stacked images is i > 22.4 mag.