TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3892 SUBJECT: Subaru Observations of GRB050724 DATE: 05/08/27 14:49:11 GMT FROM: Elena Pian at ITESRE-CNR,Bologna A. Pastorello (MPA), K. Kawabata (Hiroshima Univ.), E. Pian, (INAF-OATs), K. Nomoto (Tokyo Univ.), P. Mazzali (INAF,MPA,Tokyo), T. Hattori, M. Iye, T. Sasaki (Subaru,NAOJ), on behalf of a larger collaboration, report: On August 10, 2005, at 07.7 UT we observed the field of GRB050724 with Subaru+FOCAS and I filter. The exposure time was 2 minutes. The seeing was 0.4". No object is detected at the position of the optical transient reported by Berger et al. (submitted to Nature, astro-ph/0508115). The 3-sigma upper limit is I = 23 (this is not corrected for the Galactic reddening). This message may be cited.