TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1485 SUBJECT: GRB 020813 : KISO multiband optical observations DATE: 02/08/14 05:36:36 GMT FROM: Yuji Urata at RIKEN <urata@crab.riken.go.jp> 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.