GRB 200809B: BOOTES-3/YA optical upper limit

The 60cm BOOTES-3/YA robotic telescope at NIWA Lauder in Otago (New Zealand) gathered images covering the position of the position of the Swift/XRT X-ray afterglow of Fermi GRB 200809B (Fermi team. GCNC 28236). The first image (clear filter) was obtained starting at 09:58:18.81 UT 10th Aug (~ 18.4 hr after trigger). In the co-added image (5 exposures 60s each), no source is found at the position reported by Swift/XRT (Perri et al. GCNC 28241) down to 19.8 mag. Further observations are ongoing. We thank the staff at NIWA for its excellent support.