GCN Circular 32799
B. O'Connor (UMD/GWU), S. B. Cenko (NASA/GSFC), E. Troja (UTV/ASU), S. Dichiara (PSU), A. Kutyrev (NASA/GSFC), S. Veilleux (UMD), J. Durbak (UMD), on behalf of a larger collaboration: We performed target of opportunity observations of GRB 221009A (Dichiara et al., GCN 32632, Veres et al., GCN 32636) with the 4.3m Lowell Discovery Telescope (LDT) in Happy Jack, AZ. Observations began on October 13, 2022 at 02:05:29 UT corresponding to ~9.5 d after the GRB. We obtained images in the riz filters at an airmass ~1.1 with seeing ~1.7". The afterglow is clearly detected in each filter. We obtain the following magnitudes calibrated against the PS1 catalog: r = 21.68 +/- 0.07 AB mag i = 20.72 +/- 0.05 AB mag These magnitudes are not corrected for Galactic extinction. We thank the staff of the Lowell Observatory for assistance with these observations.