TITLE:   GCN CIRCULAR
NUMBER:  38641
SUBJECT: EP241217a: Liverpool Telescope optical upper limit
DATE:    24/12/19 22:54:28 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 the fast X-ray transient EP241217a (Zhou et al., GCN 38586) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 6x200s exposures in the SDSS i’ filter starting at 2024-12-19 20:29:08 UT, approximately 2.62 days after the trigger.

We do not detect any object at the position of the optical counterpart (Levan et al., GCN 38587, Williams et al., GCN 38596). The 3-sigma limiting magnitude of the stacked images is i > 22.4 mag. The photometry was calibrated using nearby PanSTARRS secondary standards and was not corrected for extinction.