{
  "circularId": 44433,
  "format": "text/plain",
  "createdOn": 1777548040597,
  "subject": "EP260429a: LCO optical upper limits",
  "submitter": "Rob Eyles-Ferris at U of Leicester <raje1@leicester.ac.uk>",
  "eventId": "EP260429a",
  "bibcode": "2026GCN.44433....1E",
  "submittedHow": "web",
  "body": "R. A. J. Eyles-Ferris (Leicester), J. A. Chácon (PUC), F. E. Bauer (SSI and UTA), J. Quirola-Vasquez (Radboud), D. B. Malesani (DAWN/NBI and Radboud), A. J. Levan (Radboud & Warwick), P. G. Jonker (Radboud), report on behalf of a larger collaboration:\n\nWe observed the field of the fast X-ray transient EP26029a (Wang  et al., GCN 44426) using LCO 1m telescopes located at the Cerro Tololo Inter-American Observatory (Chile) equipped with the SINISTRO instrument. A series of 6x300 s exposures were taken in each of the SDSS-r and SDSS-z filters, starting at 2026-04-30 08:23:54 UT (~18.0 hr after the trigger).\n\nNo new source is detected within or at the border of the EP/WXT uncertainty region (Wang et al., GCN 44426) nor do we identify any significant residuals in subtractions using PanSTARRS DR1 templates. From the stacked images, we obtain the following 3-sigma upper limits:
\n\nr > 22.5\nz > 20.9\n\nThese upper limits are in AB magnitudes, calibrated using nearby stars from the Pan-STARRS catalogue, and are not corrected for Galactic extinction."
}