TITLE: GCN CIRCULAR NUMBER: 6117 SUBJECT: GRB 070220: Observation with the KANATA 1.5m telescope DATE: 07/02/20 11:00:27 GMT FROM: Akira Arai at Hiroshima U A. Arai, M. Uemura and T. Uehara (Hiroshima Univ.), report on behalf of the KANATA GRB team: We perfomed optical imaging of the field of GRB070220 (GCN 6114) at 9:59-10:20 UT 20 Feb. using TRISPEC attached to the KANATA 1.5-m telescope at Higashi-Hiroshima Observatory, Japan. We obtained 10 Rc-band images with a 123-s exposure time. The images were calibrated with neighbor stars in the USNO A2.0 catalog (r mag ). We cannot significantly detect the optical afterglow at the position of the X-ray afterglow reported in GCN 6114 in our images. The limit magnitude is estimated to be 21.2 (3-sigma). UT Limit mag in Rc Exp. Time Feb. 20.42381 21.2 123 * 10 ------------------------------------------- 広島大学 大学院理学研究科 物理科学専攻 高エネルギー宇宙・素粒子実験 D1 新井 彰(Arai Akira) -------------------------------------------