{
  "bibcode": "2022GCN.32662....1K",
  "body": "H. Kumar (IITB), V. Swain (IITB), G. Waratkar (IITB), K. Angail (IAO), V.\nBhalerao (IITB), G. C. Anupama(IIA), S. Barway (IIA) report on behalf of\nthe GIT team:\n\nWe observed Swift J1913.1+1946/GRB 221009A detected by Swift (S. Dichiara\net al., GCN #32632), Fermi (P. Veres et al., GCN #32636), INTEGRAL\n(SPI-ACS) (Gotz et al., GCN #32660), and Konus-Wind (D. Svinkin et al., GCN\n#32641), with 0.7m GROWTH-India Telescope (GIT). We obtained 200-sec\nexposures in the g' and r' filters. We clearly detected the afterglow\ncandidate in our images at the position of Swift J1913.1+1946/GRB 221009A.\nThe photometric results follow as:\n\n-------------------------------------------------------------------\n\n JD (mid) | T_mid-T0(hrs) | Filter | Magnitude (AB) |\n\n-------------------------------------------------------------------\n\n2459862.18181 | 2.19 | g' | 17.66 +/- 0.07 |\n\n2459862.18451 | 2.25 | r' | 16.16 +/- 0.07 |\n\n-------------------------------------------------------------------\nThe results are consistent with Lipunov et al., GCN #. 32634 and 32639;\nPerley GCN #32638;  Broens, GCN #32640; Hu et al., GCN #32644; Belkin et\nal. GCN #32645; de Wet et al. GCN #32646; Xu et al. GCN #32647; Odeh, GCN\n#32649; Brivio et al. GCN # 32652. The magnitudes are calibrated against\nPanSTARRS DR1 (Chambers et al., 2016) and not corrected for Galactic\nextinction.\n\nThe GROWTH India Telescope (GIT) is a 70-cm telescope with a 0.7-degree\nfield of view, set up by the Indian Institute of Astrophysics (IIA) and the\nIndian Institute of Technology Bombay (IITB) with funding from DST-SERB and\nIUSSTF. It is located at the Indian Astronomical Observatory (Hanle),\noperated by IIA. We acknowledge funding by the IITB alumni batch of 1994,\nwhich partially supports the operations of the telescope. Telescope\ntechnical details are available at\nhttps://sites.google.com/view/growthindia/.",
  "circularId": 32662,
  "createdOn": 1665416339000,
  "email": "harshkosli13@gmail.com",
  "subject": "GRB 221009A / Swift J1913.1+1946: GIT detection of the optical afterglow",
  "submitter": "Harsh Kumar at Indian Inst of Tech,Bombay  <harshkosli13@gmail.com>",
  "eventId": "GRB 221009A"
}