TITLE:   GCN CIRCULAR
NUMBER:  41738
SUBJECT: EP250905a: Liverpool Telescope observations
DATE:    25/09/06 13:20:01 GMT
FROM:    Rob Eyles-Ferris at U of Leicester <raje1@leicester.ac.uk>

R. A. J. Eyles-Ferris and N. Habeeb (U of Leicester) report on behalf of a larger collaboration:

We observed the field of EP250905a with the 2m Liverpool Telescope using the IO:O instrument. We obtained 6x150s exposures in each of the SDSS r’ and SDSS g’ filters starting at 2025-09-05 22:20:05 UT, approximately 11.1 hours after the X-ray detection.

We performed image subtraction on the stacked images using reference images from Pan-STARRS and also compared the stacked and reference images manually. We detect no new sources in either the subtractions or stacked images. At the position of the optical source proposed as the counterpart by He et al. (GCN 41732) and GCN 41734, we use forced photometry to measure r = 22.6 +/- 0.4. We therefore identify no significant variability.

We derive 3-sigma upper limits of r’ > 22.5 and g’ > 21.5 with photometry calibrated to Pan-STARRS and not corrected for Galactic extinction.