GCN Circular 37810
Subject
GRB241017a: Liverpool Telescope observations of XRT uncatalogued sources
Date
2024-10-18T10:00:35Z (6 days ago)
From
A. Bochenek at Liverpool John Moores University <a.m.bochenek@2023.ljmu.ac.uk>
Via
Web form
A. Bochenek, D. A. Perley (LJMU) report:
We observed the field of GRB241017a (Le Provost et al, GCN 37799) containing all three reported uncatalogued XRT sources from the Swift ToO follow-up (Evans, GCN 37800) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 6x100s exposures with the SDSS-i filter starting at 2024-10-17 21:52:53 UT, approximately 18 hours after the SVOM trigger.
The images were stacked and a reference image of the field from SDSS DR12 was subtracted using PSF matching with the help of PSFEx. No uncatalogued optical source was detected at any of the three locations, nor in the entire field of view of IO:O. The 3-sigma limiting magnitude on the stacked image is i > 21.21 mag.