TITLE: GCN CIRCULAR NUMBER: 26603 SUBJECT: GRB 191228A: UKIRT NIR upper limit DATE: 19/12/28 07:36:11 GMT FROM: Dong Xu at NAOC/CAS D. Xu, Z.P. Zhu, B.Y. Yu, H.J. Wang, L. Ge (NAOC) report: We observed the field of GRB 191228A (Bernardini et al., GCN 26601) using the 3.8-m United Kingdom Infra-Red Telescope (UKIRT). Observations started at 04:38:02 UT on 2019-12-28 (i.e., 4.612 hr after the BAT trigger), and 3600 s H-band imagining was obtained in a seeing of ~1.0". No NIR afterglow is detected in the stacked image at the XRT position (Bernardini et al., GCN 26601), down to a limiting magnitude of H ~ 20.1, calibrated with nearby 2MASS stars. We thank the great support of the UKIRT staff/observer, in particular Michael Pohlen and Watson Varricatt.