TITLE: GCN CIRCULAR NUMBER: 29337 SUBJECT: GRB 210104A: 3.6m DOT optical upper limit DATE: 21/01/20 11:44:16 GMT FROM: Dimple Panchal at ARIES, India Dimple (ARIES), K. Misra (ARIES), A. Ghosh (ARIES), R. Gupta (ARIES), A. Kumar (ARIES), S.B. Pandey (ARIES) report: We observed the field of GRB 210104A (Troja et al. GCN #29233) with Aries Devasthal Faint Object Spectrograph and Camera (ADFOSC) mounted on the 3.6m Devasthal Optical Telescope (DOT). The observations started on 2021-01-13 at 19:52:50 UT (9.374 days after the burst). We obtained a set of consecutive images with short exposure times to avoid saturation from the nearby bright star. We do not detect any optical counterpart upto a magnitude limit of 23.2 in the stacked image.