{
  "bibcode": "2023GCN.33284....1R",
  "body": "Amit K. Ror, Ankur Ghosh, Brajesh Kumar, Rahul Gupta, A. Aryan, Dimple, S.\nB. Pandey, and K. Misra (ARIES) report:\n\nWe observed the field of GRB 230204B detected by MAXI/GSC (Serino et al.\n2023, GCN 33265) using the 3.6m Devasthal Optical Telescope located at the\nDevasthal observatory of the Aryabhatta Research Institute of Observational\nSciences (ARIES), Nainital, India.\n\nWe have taken multiple frames having an exposure time of 180 sec each in\nthe r filter. We stacked the images after the alignment. We clearly detect\nthe optical transient discovered by Swain and Kumar et al. 2023 (GCN 33269)\nin the stacked images. The estimated preliminary magnitude is the following:\n\nDate Start_UT T_start-T0 (days) Filter  Exp time (sec)       magnitude\n==============================================================\n2023-02-06 01:49:47.93   ~1.168          r        180 sec*10\n 21.04 +/- 0.04\n\nThe detection of the optical transient is consistent with the observation\nof Swain and Kumar et al. 2023 (GCN 33269), Smartt et al. 2023 (GCN 33278),\nand Saccardi et al. 2023 (GCN 33281)\n\nThe limiting magnitude quoted is not corrected for the galactic and host\nextinctions in the direction of the transient. Photometric calibration is\nperformed using the standard stars from the Pan-STARRS catalog.\n\nThis circular may be cited. The 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": 33284,
  "createdOn": 1675690511000,
  "email": "mitturor77894@gmail.com",
  "subject": "GRB 230204B: 3.6m DOT optical observation",
  "submitter": "Amit Kumar Ror at ARIES  <mitturor77894@gmail.com>",
  "eventId": "GRB 230204B"
}