TITLE: GCN CIRCULAR NUMBER: 38615 SUBJECT: EP241217a: Liverpool Telescope optical follow-up DATE: 24/12/18 12:28:22 GMT FROM: A. Bochenek at Liverpool John Moores University a.m.bochenek@2023.ljmu.ac.uk
A. Bochenek and D. A. Perley (LJMU) report:
We observed the field of the fast X-ray transient EP241217a (Zhou et al., GCN 38586) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 6x100s exposures in the SDSS i’ filter starting at 2024-12-17 21:03:57 UT, approximately 15.5 hours after the trigger.
We report a detection of the optical counterpart in the stacked images of i = 20.26 ± 0.09 mag, at a position consistent with Levan et al., GCN 38587, Williams et al., GCN 38596. This is in line with i-band decay observations from Mohan et al., GCN 38612. The inferred red r-i colour (by comparison with values reported by Izzo et al., GCN 38588, Fan et al., GCN 38592, Jin et al., GCN 38607, Zhu et al., GCN 38613) is consistent with the high spectroscopic redshift of z~4.6 reported by Levan et al., GCN 38593.
The photometry was obtained using nearby PanSTARRS standards and was not corrected for extinction.
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