GRB 221216A: AKO Upper Limit

We observed the field of GRB 221216A detected by FERMI (GCN 33066) and Swift (Dichiara et al., GCN 33067) with our 0.35m f/7.7 robotic telescope. The observation was done on 16 December 2022 from 15:17:47 to 15:32:55 (UT), 4.1 hours after the GRB trigger. We obtained multiple 180-sec exposures in Ic filter. We did not detect any afterglow within XRT localization (Evans et al., GCN 33071). This is consistent with the reported non-detections of (Lu et al., GCN 33068) and (Gendre et al., GCN 33069). The following upper limit was calculated using Atlas catalogue as a reference: ---------------------------------------------------------------------------- - JD (mid), T_mid-T0(hrs), Exposure (sec), Filter, Lim_mag ---------------------------------------------------------------------------- - 2459930.142604, 4.1, 5 x 180 (stacked), Ic, > 17.3 ---------------------------------------------------------------------------- - These magnitudes are not corrected for galactic extinction.