TITLE: GCN CIRCULAR NUMBER: 11422 SUBJECT: Optical observation of GRB 101024A DATE: 10/11/23 01:47:10 GMT FROM: AAVSO GRB Network at AAVSO Chris Stockdale (Churchill, Victoria, Australia) reports to the AAVSO International High Energy Network the following optical observation of GRB 101024 (GCN #11370, De Pasquale et al.): Chris Stockdale reports a detection of the optical afterglow of GRB 101024 (GCN #11370, De Pasquale et al.; #11371, De Pasquale et al.; #11373, Hentunen et al.; #11382, Laas-Bourez et al.; #11383 Kruehler et al.), detecting the afterglow at the same position as the Swift UVOT position. The afterglow was observed unfiltered for 24 minutes beginning at 12:42:07 UT on 2010 October 24. Thirteen exposures of 24 minutes were taken for the detection; a median combination of images 2 through 13 having a midpoint time of 12:54:25 UT on 2010 October 24 yields a CR magnitude of 19.3 with calculated S/N of 5.5; the magnitude was measured relative to the R-band catalog magnitude of USNO-B1.0 0127-0023867 (R=15.7). Observations were made using an SBIG ST-7XME CCD camera attached to a 280 mm Schmidt-Cassegrain. The position of the afterglow was imaged for an additional 60 minutes subsequent to these frames, but the source was not detected. The AAVSO High Energy Network was made possible through grants from the Charles Curry Foundation and NASA.