TITLE: GCN CIRCULAR NUMBER: 44612 SUBJECT: EP260512a: LCO optical upper limits DATE: 26/05/14 18:45:03 GMT FROM: Jonathan Quirola at Radboud University <jaquirola1990@gmail.com> J. Quirola-Vasquez (Radboud), R. A. J. Eyles-Ferris (Leicester), G. Corcoran (UCD), P. G. Jonker (Radboud), M. Fraser (UCD), A. J. Levan (Radboud & Warwick) and D. B. Malesani (DAWN/NBI and Radboud), J. A. Chacón (PUC), F. E. Bauer (SSI and UTA), report on behalf of a larger collaboration: We observed the field of the X-ray transient EP260512a (Liang et al., GCN 44594) using LCO 1m telescopes located at the McDonald Observatory (USA) equipped with SINISTRO instruments. A series of 6x300 s exposures was taken using the SDSS-r filter, starting at 2026-05-13 06:54:11 UT (i.e., ~0.93 days after the first X-ray detection). No new source is detected within or at the border of the EP/WXT (Liang et al., GCN 44594) uncertainty region compared with the Legacy Survey. From the stacked images, we obtain the following 3-sigma upper limits: r > 22.2 These upper limits are in AB magnitudes, calibrated using nearby stars from the PanSTARRS catalogue, and are not corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/44612. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...