{
  "submitter": "Agnes van Hoof at Radboud University <agnes.vanhoof@ru.nl>",
  "body": "A. P. C. van Hoof (Radboud), R. A. J. Eyles-Ferris (Leicester), J. Quirola-Vasquez (Radboud), P. G. Jonker (Radboud), D. B. Malesani (DAWN/NBI and Radboud), J. A. Chacón (PUC), F. E. Bauer (SSI and UTA), report on behalf of a larger collaboration:\n\nWe observed the field of the X-ray transient EP260526a (Yang et al, GCN 44712) using LCO 1m telescopes located at the Cerro Tololo observatory equipped with SINISTRO instruments. A series of 5x300 s exposures were taken using the SDSS-r filter and 3x300 s using the SDSS-z filter, starting on 2026-05-27 at 08:07:52 UT (i.e., ~1.4 days after the first X-ray detection).\n\nNo new source is detected within the EP/WXT uncertainty region compared with the Legacy and Pan-STARRS surveys. From the stacked images, we obtain the following 3-sigma upper limits, consistent with those reported by Becerra et al. (GCN 44710):
\n\nr > 22.5\nz > 20.6\n\nThese upper limits are in AB magnitudes, calibrated using nearby stars from the Pan-STARRS catalogue, and are not corrected for Galactic extinction.",
  "bibcode": "2026GCN.44713....1V",
  "createdOn": 1779884375758,
  "circularId": 44713,
  "eventId": "EP260526a",
  "submittedHow": "web",
  "format": "text/plain",
  "subject": "EP260526a: LCO optical upper limits"
}