TITLE: GCN CIRCULAR NUMBER: 28273 SUBJECT: GRB 200819A: Optical Observations from HCT DATE: 20/08/20 16:13:01 GMT FROM: Anirban Dutta at Indian Inst. of Astrophysics Anirban Dutta(IIA, Bengaluru), Brajesh Kumar(ARIES, Nainital), Avinash Singh, G. C. Anupama, D. K. Sahu and Pramod Kumar (IIA, Bengaluru) We observed the field of GRB 200819A (Dichiara et al., GCN #28263; Evans et al., GCN #28265) with the Himalaya Faint Object Spectrograph and Camera (HFOSC) mounted on the 2-m Himalayan Chandra Telescope (IAO, Hanle, India). Multiple frames (each 300 sec) of the GRB field in Bessell R and I bands were obtained with an average airmass of 1.3 and a seeing of 2''. Preliminary PSF photometry on the stacked images was performed and calibrated against USNO-B1 catalogue. We do not detect any OT within the enhanced XRT position (Belkin et al., GCN #28266; Jelinek et al., GCN #28267). The estimated limiting magnitude is as under - Date | UT (mean) | Filter | Exp time x no. of frames | Upper limit (mag) 2020-08-19 19:16:23 R 300 sec x 4 21.5 2020-08-19 19:32:37 I 300 sec X 4 20.3 We thank the staff at IAO and CREST for helping with the observations.