GRB221009A: LCOGT Continued Observations - Optical Upper Limits

We observed the GRB 221009A/Swift J1913.1+1946 (Dichiara et al., GCN 32632) field with the LCOGT 1-meter Sinistro instrument at the McDonald Observatory, Texas, USA site, on October 13, from 03:34 to 04:18 (corresponding to 84.60 to 85.50 hours from the GRB trigger time) with the SDSS g, r, and i filters. We performed a series of 3x300s exposures in each band. We do not detect the optical transient at the UVOT coordinates (Dichiara et al., GCN 32632), in any bands. The following upper limits are calculated using the Pan-STARRS catalog as reference: g > 22.3 r > 21.4 i > 20.5 These magnitudes are not corrected for galactic extinction.