{
  "bibcode": "2022GCN.32799....1O",
  "body": "B. O'Connor (UMD/GWU), S. B. Cenko (NASA/GSFC), E. Troja (UTV/ASU),\nS. Dichiara (PSU), A. Kutyrev (NASA/GSFC), S. Veilleux (UMD),\nJ. Durbak (UMD), on behalf of a larger collaboration:\n\nWe performed target of opportunity observations of GRB 221009A\n(Dichiara et al., GCN 32632, Veres et al., GCN 32636)\nwith the 4.3m Lowell Discovery Telescope (LDT) in Happy Jack, AZ.\nObservations began on October 13, 2022 at 02:05:29 UT corresponding\nto ~9.5 d after the GRB. We obtained images in the riz filters at\nan airmass ~1.1 with seeing ~1.7\".\n\nThe afterglow is clearly detected in each filter. We obtain the\nfollowing magnitudes calibrated against the PS1 catalog:\n\nr = 21.68 +/- 0.07 AB mag\ni = 20.72 +/- 0.05 AB mag\n\nThese magnitudes are not corrected for Galactic extinction.\n\nWe thank the staff of the Lowell Observatory for assistance\nwith these observations.",
  "circularId": 32799,
  "createdOn": 1666151998000,
  "email": "oconnorb@umd.edu",
  "subject": "GRB 221009A: Continued LDT Afterglow Monitoring",
  "submitter": "Brendan O'Connor at UMD  <oconnorb@umd.edu>",
  "eventId": "GRB 221009A"
}