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TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1936 SUBJECT: GRB 030227: Optical limit at RIKEN DATE: 03/03/10 11:14:26 GMT FROM: Ken ichi Torii at RIKEN <torii@crab.riken.go.jp> K. Torii (RIKEN), T. Kato (Kyoto U.), and H. Yamaoka (Kyushu U.) report: In response to the IBAS alert message (INTEGRAL Trigger #214), the entire error region of GRB 030227 (Gotz, et al., GCN 1895 and 1896) was observed by the automated system at RIKEN (0.25-m f/6.8 reflector equipped with unfiltered CCD AP6E). The observation started at 2003 Feb. 27 09:31:39 UT (49 minutes after the burst). After 73 frames of 40-s integration were acquired, 60-s integration was repeated. We have applied PSF photometry to these data. The optical transient (Casto-Tirado, et al., GCN 1904; Soderberg, et al., GCN 1907; Berger, et al., GCN 1910) is not significantly detected. By using Henden's sequence (GCN 1917), we preliminarily estimate a star at (04:57:16.351, +20:27:00.66) (USNO-A2.0 position) as Rc = 11.7 and derive 3-sigma upper limits for the optical transient as follows. ------------------------------------------------------- Rc Mag. / Mean Epoch (UT) / (Start - End) / Integration ------------------------------------------------------- >20.3 09:41:03 (09:31:39 - 09:50:26) 40-s x 24 frames >20.4 10:08:45 (09:50:31 - 10:26:58) 40-s x 49 frames -------------------------------------------------------
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