TITLE: GCN CIRCULAR NUMBER: 39306 SUBJECT: EP trigger 10202399251 (possibly EP250212a): NOT J-band upper limit DATE: 25/02/12 23:03:14 GMT FROM: Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl> D. B. Malesani (DAWN/NBI and Radboud Univ.), A. Martin-Carrillo (UCD), P. G. Jonker (Radboud), L. Galbany (ICE-CSIC), K. Phan (ICE-CSIC), B. Hauptmann (NOT and DTU Space) report on behalf of a larger collaboration: We observed the field of the EP trigger 10202399251, which occurred on 2025 Feb 12 (possibly named EP250212a), using the Nordic Optical Telescope (NOT) equipped with the NOTCam near-infrared imager. Observations were conducted in the J band, for a total of 18x60 s exposures, with a mid time of 2025 Feb 12.837 UT (12.3 hr after the EP trigger). Within the error circle of the EP/FXT X-ray counterpart, we detect no new sources down to a limiting magnitude of J = 20.9 (Vega), calibrated against nearby stars from the 2MASS catalog. View this GCN Circular online at https://gcn.nasa.gov/circulars/39306. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...