{
  "bibcode": "2021GCN.31299....1G",
  "body": "Rahul Gupta, S. B. Pandey, A. Ror, A. Kumar, A. Aryan, Dimple, A. Ghosh, B.\nKumar, and K. Misra (ARIES) as a part of larger international collaboration:\n\n\nWe performed late-time photometric observations of the optical afterglow (Zheng\nand Filipenko GCN 31203) of Fermi (Fermi GBM team, GCN 31201) and Swift (D'Ai\net al., GCN 31202) detected GRB 211211A using the 4Kx4K CCD Imager (Pandey\net al. 2017, arXiv:1711.05422v1) mounted at the axial port of the 3.6m\nDevasthal Optical Telescope of ARIES Nainital at multiple epochs in several\nfilters. We report the preliminary brightness of the afterglow to be R =\n21.66 +/- 0.07 mag ~ 1.41 days after the GBM trigger. At successive epochs,\nwe obtained the limiting mag of 23.7 mag ~ 4.42 days post-burst. Our\nobservations are consistent with the rapid decay nature of the afterglow\nreported by de Ugarte Postigo et al. GCN 31229 and A. Moskvitin et al. GCN\n31234.\n\nThe magnitude value reported is calibrated against UNSO B1 nearby stars.\n\nThis circular may be cited. 3.6m Devasthal Optical Telescope (DOT) is\nthe recently commissioned facility in the Northern Himalayan region of\nIndia (long:79 41 04E, lat:29 21 40N, alt:2540m) owned and operated by the\nAryabhatta Research Institute of Observational Sciences (ARIES), Nainital (\nhttps://www.aries.res.in). Authors of this GCN circular thankfully\nacknowledge consistent support from the staff members to run and maintain\nthe 3.6m DOT.",
  "circularId": 31299,
  "createdOn": 1640364023000,
  "email": "rahulbhu.c157@gmail.com",
  "subject": "GRB 211211A: observations with the 3.6m Devasthal Optical Telescope",
  "submitter": "Rahul Gupta at ARIES, India  <rahulbhu.c157@gmail.com>",
  "eventId": "GRB 211211A"
}