TITLE:   GCN CIRCULAR
NUMBER:  35783
SUBJECT:  Transient EPW20240219aa: Liverpool Telescope non-detection and limiting magnitude
DATE:    24/02/23 17:19:29 GMT
FROM:    A. Bochenek at Liverpool John Moores University <a.m.bochenek@2023.ljmu.ac.uk>

A. Bochenek, K-R. Hinds, D. A. Perley (LJMU) report:
 
We observed the field of the X-ray transient and possible gamma-ray burst EPW20240219aa (Zhang et al., ATel 16463; Zhang, ATel 16472;  Zhang et al., GCN 35773) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 3x120s exposures with the SDSS-I filter between 2024-02-21 20:05:42 UT and 2024-02-21 20:13:20 UT, approximately 2.5 days after the transient.
 
The limiting magnitude of the image is 22.12 mag (AB). Image subtraction was performed relative to Pan-STARRS reference imaging using PSF matching, with the help of PSFEx. No new sources were identified within the 90% confidence error circle.