TITLE: GCN CIRCULAR NUMBER: 12935 SUBJECT: GRB 120212A: Kanata/HOWPol optical observation DATE: 12/02/12 13:06:41 GMT FROM: Koji Kawabata at HASC,Hiroshima U K. S. Kawabata, H. Akitaya, M. Yamanaka, K. Takaki, T. Uehara, and M. Yoshida (Hiroshima Univ.) report on behalf of Kanata team: We performed a series of optical imaging polarimetry for the optical afterglow of GRB 120212A (Guidorzi et al.; GCN 12932) using HOWPol attached to the 1.5-m Kanata telescope at Higashi-Hiroshima Observatory, Japan. Our first exposure began at t=74 sec since Swift/BAT trigger (Sonbas et al.; GCN 12930), but the bright twilight sky shaded the afterglow until t=22 min. Our quick-look analysis indicates that Rc magnitude of the afterglow was 16.5 at t=23 min and faded to 17.6 at t=58 min. Further analysis is ongoing.