{
  "body": "A. Bochenek and D. A. Perley (LJMU) report:\n \nWe observed the field of the fast X-ray transient EP250321a (Hu et al., GCN 39800) using the IO:O optical camera on the 2m robotic Liverpool Telescope. We obtained 6x100s exposures in the SDSS r’ and i’ filters, starting at 2025-03-22 00:24:35 UT, approximately 18.24 hours after the trigger.\n \nWe report a detection in the stacked images in the i band at the position of the optical counterpart (Fu et al., GCN 39804) of the magnitude i = 22.08 ± 0.16. In the r-band stacked images, we report a non-detection with the 3-sigma limiting magnitude of r > 22.19 mag. Our results are in agreement with previous observations (Fu et al., GCN 39804; Perez-Garcia et al al., GCN 39805; Brivio et al., GCN 39807; Zhu et al., GCN 39809; Becerra et al., GCN 39810; Pérez-Fournon et al., GCN 39812; Lee et al., GCN 39815; Ghosh et al., GCN 39816; Han et al., GCN 39817; Jin et al., GCN 39822; Zhu et al., GCN 39827; Gill et al., GCN 39831; Zheng et al., GCN 39832; Pankov et al., GCN 39836).\n\nMJD (mid)          T_mid - T_0      Filter     Mag. (AB)\n60756.02120        18.34 h             r         > 22.19\n60756.02976        18.55 h             i         22.08 ± 0.16\n \nThe photometry was calibrated using nearby PanSTARRS secondary standards and was not corrected for extinction.",
  "subject": " EP250321a: Liverpool Telescope optical follow-up",
  "createdOn": 1742667933112,
  "eventId": "EP250321a",
  "version": 2,
  "editedOn": 1742733589172,
  "format": "text/plain",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of A. Bochenek at Liverpool John Moores University <a.m.bochenek@2023.ljmu.ac.uk>",
  "submitter": "A. Bochenek at Liverpool John Moores University <a.m.bochenek@2023.ljmu.ac.uk>",
  "bibcode": "2025GCN.39837....1B",
  "submittedHow": "web",
  "circularId": 39837
}