GCN Circular 22298
D. Malesani (DARK/NBI), K. E. Heintz (Univ. Iceland and DARK/NBI), A. Sagues Carracedo (NOT), Andreas Kjaer Dideriksen (Aarhus Univ.), report on behalf of a larger collaboration: We observed the field of GRB 180102A (Page et al., GCN 22292; Veres, GCN 22295) with the Nordic Optical Telescope (NOT) equipped with the AlFOSC camera. Observations were carried out in the SDSS r and z filters (900 and 1000 s exposure, respectively), with a seeing of 1.5", and started on 2018 Jan 3.1769 UT (12.42 hr after the GRB trigger). At the position of the X-ray counterpart (D'Ai et al., GCN 22296), no objects are detected down to (preliminary) limiting magnitudes r = 22.5, z = 22.0 (all AB, calibrated with reference to nearby Pan-STARRS stars).