TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1501 SUBJECT: GRB020813: optical observations at Bisei DATE: 02/08/17 05:49:31 GMT FROM: Yuji Urata at RIKEN T. Kawabata (BAO), Y. Urata (Titech / RIKEN), H. Yamaoka (Kyushu U) report: We have obtained 36 R band images (each exposure time 60 seconds) of the afterglow of GRB020813 (Fox, Blake & Price, GCN #1470) with the Bisei Astronomical Observatory (BAO) 1.01-m telescope during 2002 Aug. 13 11:44 to 12:40 UT. A combined image of all exposures gives R = 19.35 +/- 0.13 using r magnitudes of near USNO_A2.0 stars as photometric references. A combined image can be found at http://www.town.bisei.okayama.jp/bao/astro/grb/grb020813.jpg This message may be cited.