TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1128 SUBJECT: GRB011019: Subaru Optical Observations DATE: 01/11/03 18:46:39 GMT FROM: George Kosugi at Subaru Telescope Y. Komiyama, on behalf of the SuprimeCam Team: G. Kosugi, N. Kobayashi, Y. Mizumoto, M. Iye, R.Ogasawara T. Takata, K. Sekiguchi, T. Yamada, J. Watanabe, and T. Totani, on behalf of the Subaru GRB Team: We have obtained several R-band images with the Subaru 8.2m telescope atop Mauna Kea on 2001 October 20 beginning at 10:14 (25.5 hours after the burst), 10:19, 12:21, and 12:26 UT to search fading objects. The observing instrument was Suprime-Cam and the central 34 x 50 arcmin of the HETE error box (GCN 1109) was covered by two consecutive pointings with the exposure time of 180 seconds each. Due to the heavy cirrus coverage the limitting magnitude was R = 22.5 (+/- 0.2 mag of photometric measurement error at the magnitude) for the first exposures and R = 25.0 (+/- 0.2) for the second exposures. We find no new object down to the DSS-2 limit within our field and no fading object with the variability grater than 3 sigma threshould of the photometric error in 2 hours.