TITLE: GCN CIRCULAR NUMBER: 32841 SUBJECT: GRB 221024A: GIT confirmation of the optical afterglow DATE: 22/10/25 09:04:49 GMT FROM: Harsh Kumar at Indian Inst of Tech,Bombay V. Swain (IITB), H. Kumar (IITB), A. Kaysang (IAO), V. Bhalerao (IITB), G. C. Anupama(IIA) and S. Barway (IIA) report on behalf of the GIT team: We observed GRB 221024A detected by Swift-BAT (R. Brivio et al., GCN #32827) with 0.7m GROWTH-India Telescope (GIT). We obtained multiple 300s exposures in the r' filter and clearly detected the afterglow in our image at R.A.= 11:18:57.78 DEC = +33:02:30.64. The photometric results follow as: -------------------------------------------------------------------- JD (Start) | T_Start-T0(hrs) | Filter | Magnitude (AB) | -------------------------------------------------------------------- 2459877.42179 | 9.12 | r' | 18.36 +/- 0.05 | 2459877.45883 | 10.00 | r' | 18.50 +/- 0.1 | -------------------------------------------------------------------- GIT photometry and results from Jan Strobl et al. (GCN #32838) conclude that the source is fading and is an afterglow of GRB 221024A. 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/.