TITLE: GCN CIRCULAR NUMBER: 1485 SUBJECT: GRB 020813 : KISO multiband optical observations DATE: 02/08/14 05:36:36 GMT FROM: Yuji Urata at RIKEN Y. Urata (1,2), T. Miyata (3), S. Nishiura (3), Y. Nakata (3), T. Aoki (3), T. Soyano (3), K. Tarusawa (3), H. Mito(3), A. Yoshida (1,4), T. Tamagawa (1) 1: RIKEN, 2: Titech, 3: Tokyo Univ. 4:AGU We have observed the optical transient (OT) of GRB020813 (Fox, Blake & Price, GCN #1470) with the KISO observatory 1.05 m Schmidt telescope. We obtained four data sets for each B,V,R,I band during 2002 Aug. 13 10:52 to 16:46 UT. We detected the OT in the first data set of B (11:58-12:17 UT) , R(10:52-11:11 UT), I (11:14-11:33 UT). Due to the bad weather condition, we could not detect it in V band. A preliminary analysis suggests that the OT is at R=19 in comparison with the USNO-A2.0 star (U0675_34232257). Analysis of the full data set is underway. These images can be found at http://cosmic.riken.go.jp/urata/GRB/GRB020813/ . This message may be cited.