{
  "bibcode": "2023GCN.33149....1R",
  "body": "Amit K. Ror, Rahul Gupta, S. B. Pandey, A. Aryan, A. Ghosh, Dimple, and K.\nMisra (ARIES) report:\n\nWe observed the field of GRB 221231A detected by Fermi/GBM (2022, GCN\n33129) using the 3.6m Devasthal Optical Telescope of ARIES Nainital. We\nhave taken multiple frames having an exposure time of 200 sec in the r\nfilter. We stacked the images after the alignment. We did not find any\nevidence of an afterglow candidate inside the Swift XRT error circle (Perri\net al. 2023, GCNs 33135 and 33139). We obtained the limiting mag of ~ 21.7\nmag at ~ 1.87 days post-detection. The non-detection of the optical\nafterglow is consistent with Odeh 2023, GCN 32876.\n\nThe limiting magnitudes quoted are not corrected for the Galactic and host\nextinction in the direction of the burst. Photometric calibration is\nperformed using the standard stars from the Pan-STARRS catalog.\n\nThis circular may be cited. 3.6m Devasthal Optical Telescope (DOT) is a\nrecently commissioned facility in the Northern Himalayan region of India\n(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). The authors of this GCN circular thankfully\nacknowledge the consistent support from the staff members to run and\nmaintain the 3.6m DOT.",
  "circularId": 33149,
  "createdOn": 1672840574000,
  "email": "mitturor77894@gmail.com",
  "subject": "GRB 221231A: 3.6m DOT optical upper limit",
  "submitter": "Amit Kumar Ror at ARIES  <mitturor77894@gmail.com>",
  "eventId": "GRB 221231A"
}