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GCN Circular 41263

Subject
EP250806a: Liverpool telescope optical upper limit
Event
EP250806a
Date
2025-08-07T11:08:34Z (19 days ago)
From
Amit Kumar at Royal Holloway - UoL/ U of Warwick, UK <amitkundu515@gmail.com>
Via
Web form
A. Kumar, J. R. Maund (RHUL), N. C. Sun (UCAS), W. X. Li, Y. N. Wang (NAOC), and K. Wiersema (Herts) report:

We observed the field of EP/WXT triggered X-ray transient EP250806a (Yang et al., GCN 41246; Liang et al., GCN 41256) with the IO:O Imager at the 2m Liverpool telescope. We observed 360s x 2 frames in the g-band starting at 2025-08-07 UT 01:03:11 (~15.7 hours post-trigger). Preliminary photometry on the stacked image was performed and calibrated against the SDSS catalogue stars.

We do not detect any source at the location of the SVOM/VT optical candidate of EP250806a (Xin et al., GCN 41254; Becerra et al., GCN 41255) down to a limiting g-band magnitude of >22.5 (AB).

Reported magnitude is not extinction-corrected.
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