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GCN Circular 41742

Subject
EP250905a: Liverpool Telescope i-band upper limits
Event
EP250905a
Date
2025-09-06T21:23:03Z (2 months ago)
From
A. Bochenek at Liverpool John Moores University <a.m.bochenek@2023.ljmu.ac.uk>
Via
Web form
A. Bochenek and D. A. Perley (LJMU) report:

We observed the field of the fast X-ray transient EP250905a (Liu et al., GCN 41574) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 6x100s exposures in the SDSS i’ filter starting at 2025-09-05 22:06:03 UT, approximately 10.9 hours after the trigger.
 
We performed image subtraction of the stacked images against Pan-STARRS using PSF matching with the help of PSFEx. We do not detect the reported optical counterpart (He et al., GCN 41732, as well as GCN 41734) nor any new objects within the EP/FXT error region of the transient (Cheng et al., GCN 41725; Wang et al., GCN 41737). The 3-sigma limiting magnitude on the stacked images is i > 22.6 mag.
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