TITLE: GCN CIRCULAR NUMBER: 44897 SUBJECT: EP260610b: Gemini North optical counterpart candidate DATE: 26/06/10 16:54:45 GMT FROM: Jonathan Quirola at Radboud University <jaquirola1990@gmail.com> A. J. Levan (Radboud & Warwick), J. Quirola-Vasquez (Radboud), R. A. J. Eyles-Ferris (Leicester), G. Corcoran (UCD), A. P. C. van Hoof (Radboud), P. G. Jonker (Radboud), D. B. Malesani (DAWN/NBI and Radboud), J. Chacón (PUC), H. Sun (NAO, CAS), F. E. Bauer (SSI and UTA) report on behalf of a larger collaboration: We observed the localisation region of EP260610b (Wu et al. 2026, GCN 44895) with the Gemini North Telescope and the GMOS-N instrument on Mauna Kea, Hawaii, USA. Observations began at 13:36:51 UT on 10 June 2026 and consisted of 7 × 100 s exposures in the SDSS r band (~0.81 hr after T0) and 3 × 100 s exposures in the SDSS z band (~1.08 hr after T0). By comparison with the Legacy Survey images, we identify a candidate optical counterpart at the following coordinates (J2000): RA = 17:50:29.72 Dec = +46:32:10.6 Photometry performed on the stacked images yields r = 22.23 ± 0.03 and z = 22.19 ± 0.05 AB mag, calibrated against nearby stars from the Pan-STARRS catalog and not corrected for Galactic extinction. We acknowledge the excellent support from the Gemini North staff in the execution of these challenging observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/44897. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...