{
  "bibcode": "2022GCN.31738....1K",
  "body": "H. Kumar (IITB), J. Stanzin (IAO), V. Bhalerao (IITB), G. C. Anupama (IIA),\nS. Barway (IIA) report on behalf of the GIT team:\n\nWe observed GRB 220310A detected by MAXI/GSC H. Negoro et al., (GCN #31725)\nand optical afterglow discovered by V. Lipunov (GCN #31732), with 0.7m\nGROWTH-India Telescope (GIT). We obtained multiple 300-sec exposures in the\ng',r' and i' filters. We clearly detected the afterglow in our stacked\nimage. The photometric results follow as:\n\n-------------------------------------------------------------------\n\n JD (mid) | T_mid-T0(days) | Filter | Magnitude (AB) |\n\n-------------------------------------------------------------------\n\n2459649.085963 | 0.566 | g' | 19.86 +/- 0.03\n\n2459649.093405 | 0.574 | r' | 19.45 +/- 0.04\n\n2459649.100833 | 0.581 | i' | 19.11 +/- 0.04\n\n2459649.327412 | 0.810 | g' | 20.66 +/- 0.08\n\n2459649.334752 | 0.815 | r' | 20.21 +/- 0.07\n\n2459649.342128 | 0.823 | i' | 19.70 +/- 0.09\n\n-------------------------------------------------------------------\n\nOn the basis of fading seen in our observations, we confirm the MASTER OT\nJ111302.33+231508.0 (GCN #31732) as an afterglow of GRB 220310A. Further,\nusing our r'-band data, we estimated the index of power-law decay index =\n1.99 +/- 0.17. The magnitudes are calibrated against PanSTARRS DR1\n(Chambers et al., 2016) and not corrected for Galactic extinction.\n\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": 31738,
  "createdOn": 1646994188000,
  "email": "harshkosli13@gmail.com",
  "subject": "GRB 220310A: GIT confirmation of optical afterglow.",
  "submitter": "Harsh Kumar at Indian Inst of Tech,Bombay  <harshkosli13@gmail.com>",
  "eventId": "GRB 220310A"
}