TITLE: GCN CIRCULAR NUMBER: 31793 SUBJECT: GRB 220325A: 1.3m DFOT Optical upper limit DATE: 22/03/26 09:35:16 GMT FROM: Rahul Gupta at ARIES, India Rahul Gupta, Amit Ror, Amit Kumar, Dimple, Ankur Ghosh, Amar Aryan, Krishan Chand, S. B. Pandey, and Kuntal Misra (ARIES) report: We observed the Swift-BAT and Fermi-GBM Sub-Threshold detected GRB 220325A ( Ferro et al., GCN 31787; Wood, GCN 31791) 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 2022-03-25 at ~ 22:15 UT, i.e., ~ 5 hours after the BAT trigger. We have taken multiple frames having an exposure time of 300 sec in the R filter. We stacked the images after the alignment. We did not detect any new optical source within the Swift XRT uncertainty circle (Osborne et al., GCN 31790) in our stacked image. We obtain the following 3-sigma upper limit in the stacked image. Date Start_UT T_start-T0 (hour) Filter Exp time (sec) Limiting magnitude ==================================================== 2022-03-25 22:15 ~5 R 300*20 > 21.7 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 catalog. This circular may be cited.