I observed the optical afterglow of the extremely bright GRB 221009A = Swift J1913.1+1946 https://www.astronomerstelegram.org/?read=15650 remotely using 0.61-m f/6.5 Corrected Dall-Kirkham telescope of Burke-Gaffney Observatory on 2022-10-10.

My photometric data (magnitude faded from 15.54 to 15.92 Ic in one hour): https://gcn.gsfc.nasa.gov/gcn3/32664.gcn3

More information about this GRB: https://forum.cosmoquest.org/forum/science-and-space/astronomy/3704483-godzillarb-221009a-king-of-the-monsters

Image: stacked 12x300 sec., Ic filter.