TITLE: GCN CIRCULAR NUMBER: 29301 SUBJECT: GRB 210112A: 1.3m DFOT Optical upper limit DATE: 21/01/13 19:54:17 GMT FROM: Rahul Gupta at ARIES, India Rahul Gupta (ARIES), Amit Kumar (ARIES), Dimple (ARIES), Ankur Ghosh (ARIES), Krishan Chand (ARIES), Amar Aryan (ARIES), Shashi B. Pandey (ARIES), and Kuntal Misra (ARIES) report: We observed the filed of Swift and AGILE detected GRB 210112A (Ambrosi et al., GCN 29289; and Ursi et al., GCN 29293) with 1.3m Devasthal Fast Optical Telescope (DFOT) located at Devasthal observatory of Aryabhatta Research Institute of Observational Sciences (ARIES), India. The observations were started on 2021-01-13 at 00:06:18 UT i.e. ~ 22.49 hours after the BAT trigger. We have taken multiple frames having an exposure time of 120 s in the R filter. We do not detect the optical afterglow candidate (Ambrosi et al., GCN 29289; and Kann et al., GCN 29296) within enhanced Swift-XRT position (Goad et al., GCN 29290). We obtain the following 3-sigma upper limits in the stacked image. Date Start_UT T_start-T0 (hrs) Filter Exp time (s) Limiting Magnitude ============================================================ 2021-01-13 00:18:18 22.69 R 120*12 > 22.0 The magnitude is not corrected for the Galactic extinction in the direction of the burst. Photometric calibration is performed using the standard stars from the USNO-B1.0 catalogue. This circular may be cited.