TITLE: GCN CIRCULAR NUMBER: 18932 SUBJECT: GRB 160123A: NOT J-band observations DATE: 16/01/24 02:59:39 GMT FROM: Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst Daniele Malesani (DARK/NBI), Anlaug Amanda Djupvik (NOT), Tom Reynolds (NOT and Tuorla Obs.), and Pall Jakobsson (Univ. Iceland) report on behalf of a larger collaboration: We observed the field of GRB 160123A (Malesani et al., GCN 18926) with the Nordic Optical Telescope (NOT) equipped with the NOTCam near-infrared camera. Observations were carried out in the J filter. Sky conditions were not optimal, with moonlit clouds and a seeing of 1.7". Three sets of nine images by 1 minute each were acquired, starting on Jan 24.067 UT (16.6 hr after the GRB). After stacking the best 18 images, no source is detected within the XRT localization area (Beardmore et al., GCN 18927; see also http://www.swift.ac.uk/xrt_positions/00671447/), down to a limiting magnitude J > 19.5 (Vega), calibrated against the 2MASS catalog.