GCN Circular 11093
Myungshin Im, Won-Kee Park (CEOU/Seoul National Univ), Soojong Pak, Hyeongju Jeong, Eunbin Kim, and Jinyoung Kim (Kyunghee University) We observed GRB 100814A (Beardmore et al. GCN 11087) with the SDSS r- and i-filters during the commissioning run of CQUEAN (the Camera for QUasars in the Early uNiverse) on the 2.1m telescope at the McDonald Observatory. The observation started at 2010 August 14, 08:57:54 UT, about 5 hours after the BAT trigger. A series of 180 secs exposures were taken, and we confirm the afterglow at the location reported by Schaefer et al. (GCN 11086) and Gorosabel et al.(GCN 11090). A preliminary photometry from a single frame with the mid-point time of 09:00:24 UT is r ~ 19.10 +- 0.03 AB mag (subject to systematic error in the zero point determination), consistent with the value reported by Filgas et al. (GCN 11091). The photometric calibration is based on a standard star observation on the same night (BD+17 4708). We thank the staffs of the McDonalnd Observatory, Peter S. Odoms and John Kuehne for their assistance of the CQUEAN commissioning run.