TITLE: GCN CIRCULAR NUMBER: 32876 SUBJECT: GRB 221028A: GIT optical upper limit DATE: 22/10/28 15:26:09 GMT FROM: Harsh Kumar at Indian Inst of Tech,Bombay H. Kumar (IITB), G. Waratkar, V. Swain (IITB), Anirban Dutta (IIA), G. C. Anupama(IIA), K. Angail (IAO), V. Bhalerao (IITB), S. Barway (IIA) report on behalf of the GIT team: We observed GRB 221028A detected by Swift (A. Y. Lien et al. GCN # 32874) with 0.7m GROWTH-India Telescope (GIT). We obtained two 300-sec exposures in the r' filter. We did not detect any new source within a 5-arcsec radius uncertainty circle around the Swift-XRT position (A. Y. Lien et al. GCN # 32874) in our stacked image. The upper limit follows as: ------------------------------------------------------------------- JD (mid) | T_mid-T0(hrs) | Filter | Lim_Mag (5-sigma) | ------------------------------------------------------------------- 2459881.102968 | 1.2 | r' | > 20.24 | ------------------------------------------------------------------- The magnitudes are calibrated against PanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic extinction. The GROWTH India Telescope (GIT; Kumar et al. 2022 ) is a 70-cm telescope with a 0.7-degree field of view, set up by the Indian Institute of Astrophysics (IIA) and the Indian Institute of Technology Bombay (IITB) with funding from DST-SERB and IUSSTF. It is located at the Indian Astronomical Observatory (Hanle), operated by IIA. We acknowledge funding by the IITB alumni batch of 1994, which partially supports the operations of the telescope. Telescope technical details are available at https://sites.google.com/view/growthindia/.