{
  "bibcode": "2022GCN.31503....1F",
  "body": "Ahmed M. Fouad, Ali Takey & Yosry Azzam at KAO observatory, Egypt report:\n\nThe observation of GRB 211221A started on 2021-12-21 from 22:25:01 UT to\n23:10:10 UT,\ni.e. 1hr_36m_21s  to  2hr_21m_30s  after the BAT trigger (Evans et al. GCN\nCirc. 31273).\n\nNo detection of the afterglow in the optical Bessel V & R bands consistent\nwith the XRT position,\nthe magnitude limit in the GRB field according to the faintest objects is V\n= 22.92 & R = 22.15.\nThe instrumental magnitudes were computed using aperture photometry in\nphotutils (python package).",
  "circularId": 31503,
  "createdOn": 1642686620000,
  "email": "ahmed.fouad@nriag.sci.eg",
  "subject": "GRB 211221A: No V & R detection, KAO telescope",
  "submitter": "Ahmed Fouad at NRIAG  <ahmed.fouad@nriag.sci.eg>",
  "eventId": "GRB 211221A"
}