GCN Circular 39306
Subject
EP trigger 10202399251 (possibly EP250212a): NOT J-band upper limit
Date
2025-02-12T23:03:14Z (10 days ago)
From
Daniele B. Malesani at IMAPP / Radboud University <d.malesani@astro.ru.nl>
Via
Web form
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.