TITLE: GCN CIRCULAR NUMBER: 44705 SUBJECT: EP-WXT 01709266106: NOT optical upper limits DATE: 26/05/26 22:44:16 GMT FROM: Agnes van Hoof at Radboud University <agnes.vanhoof@ru.nl> A. P. C. van Hoof (Radboud), G. Corcoran (UCD), R. A. J. Eyles-Ferris (Leicester), J. Chacón (PUC), J. N. D. van Dalen (Radboud), P. G. Jonker (Radboud), report on behalf of a larger collaboration: We observed the field of the Einstein Probe trigger WXT 01709266106, using the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations were obtained in the SDSS r (3x300 s) and z (5x200 s) bands, starting on 2026-05-26 at 21:01:29 UT (~3.4 hours after the WXT trigger). We do not find any new, uncatalogued sources within the EP-WXT uncertainty region compared to Hyper Suprime-Cam and Legacy Survey images (DR10). From the stacked images we obtain the following 3-sigma upper limits: r > 20.17 z > 19.40 These limits are in the AB system, were calibrated using nearby stars from the Pan-STARRS catalog and are not corrected for Galactic extinction. View this GCN Circular online at https://gcn.nasa.gov/circulars/44705. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...