GRB 221009A: Pan-STARRS optical photometry

Daily imaging has been acquired (weather permitting) of the optical counterpart of Swift J1913.1+1946 (Dichiara et al., GCN 32632; Lipunov et al.,GCN 32634), the optical afterglow of GRB 221009A (Kennea & Williams, GCN 32635; Veres et al., GCN 32636) with Pan-STARRS2 since MJD 59863 (2022-10-11). The following table shows the most recent observations. MJD filter mag dmag 59866.22756 r 20.92 0.05 59866.22504 i 19.88 0.02 59866.22371 z 19.21 0.02 59866.22239 y 18.77 0.03 We observed an initial fade of approximately 0.9 mags per day in i, z and y, slowing to about 0.4 mags per day in these filters over the last 2 days.