{
  "bibcode": "2021GCN.31017....1K",
  "body": "H. Kumar(IITB), S. Joharle (IITB), J. Stanzin (IAO), V. Bhalerao(IITB), G.\nC. Anupama(IIA), S. Barway(IIA) report on behalf of the GIT team:\n\nWe continued the observation of X-ray source (#4) by Swift-XRT ToO\nobservations (M. Perri et al. GCN # 31013), a candidate for the afterglow\nof Fermi GBM GRB 211024A (GCN 30962), A. Tohuvavohu et al., (GCN #31006),\nwith 0.7m GROWTH-India Telescope (GIT). We obtained multiple exposures of\n300 sec each in the g', r' and i' filters. The photometric results follow\nas:\n\n-------------------------------------------------------------------\n\n JD (Start) | T_start-T0(days) | Filter | Magnitude (AB) |\n\n-------------------------------------------------------------------\n\n 2459515.167376 | 3.60 |  g' |  20.25 +/- 0.06\n\n 2459515.136124 | 3.57 |  i' |  19.68 +/- 0.057\n\n 2459515.146851 | 3.58 |  r' |  19.85 +/- 0.034\n\n-------------------------------------------------------------------\nComparing magnitude in r' filter with our previous photometry reported in\nH. Kumar et al., (GCN #31014), we conclude that the source is not evolving\nand is not an afterglow of the GRB 211024A.\n\nWe did not detect sources #3,#5,#6 of Swift-XRT ToO observations (M. Perri\net al. GCN # 31013) up to the following upper limits:-\n\n-------------------------------------------------------------------\n\n JD (Start) | T_start-T0(days) | Filter | upper limit |\n\n-------------------------------------------------------------------\n\n 2459514.2374 | 2.67 | r' | > 20.26\n\n 2459515.1674 | 3.60 | g' | > 21.03\n\n 2459515.1361 | 3.58 | i' | > 20.51\n\n -------------------------------------------------------------------\n\nThe magnitudes are calibrated against PanSTARRS (Flewelling et al., 2018)\nand not corrected for Galactic extinction.\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 operations of the telescope. Telescope technical\ndetails are available at https://sites.google.com/view/growthindia/.",
  "circularId": 31017,
  "createdOn": 1635422968000,
  "email": "harshkosli13@gmail.com",
  "subject": "GRB 211024A: Swift-XRT source 4 is not an afterglow.",
  "submitter": "Harsh Kumar at Indian Inst of Tech,Bombay  <harshkosli13@gmail.com>",
  "eventId": "GRB 211024A"
}