GCN Circular 41655
Subject
EP250827b: Liverpool Telescope observations
Event
Date
2025-09-02T08:06:57Z (11 days ago)
From
Rob Eyles-Ferris at U of Leicester <raje1@leicester.ac.uk>
Via
Web form
R. A. J. Eyles-Ferris and R. L. C. Starling (U of Leicester) report on behalf of a larger collaboration:
We observed the position of EP250827b/AT 2025wkm (Schroeder et al., GCN 41635) with the 2m Liverpool Telescope using the IO:O instrument. We obtained a series of exposures in the SDSS u’g’r’i’z’ filters starting at 2025-09-02 02:47:47 UT, approximately 139.5 hours after the X-ray detection.
We performed image subtraction on the stacked g’r’i’z’ images using reference images from Pan-STARRS. We clearly detect a source consistent with AT 2025wkm in all our subtractions and measure r’ = 19.97 +/- 0.04. Our measured magnitude compared to Schroeder et al. (GCN 41635) and Hall et al. (GCN 41636) suggests AT 2025wkm may still be rising in the r band. The colour of the source (g’ - r’ ~ 0.0) is consistent with the blue spectrum observed by Sevilla and Ho (GCN 41639).
Further observations are planned.