TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3121 SUBJECT: GRB 050319: Optical observation DATE: 05/03/19 17:30:56 GMT FROM: Ken ichi Torii at RIKEN K. Torii (Osaka U.) reports "The error region of GRB 050319 (GCN 3117) was observed by the ART 14-inch telescope. BVRcIc imaging started at 2005 March 19, 11:24 UT and 60-s exposure in each filter was repeated. By stacking twenty Rc and twenty Ic frames obtained between 11:36 UT and 13:05 UT (Mean Epoch 12:20 UT), we note an enhancement of 2.3-sigma level at the position of the optical afterglow (GCN 3116). The enhancement in the stacked frame corresponds to 19.6 mag with reference to USNO-A2.0 red magnitude. Combining this magnitude and those reported in GCN 3116 and GCN 3120, the early optical afterglow of GRB 050319 decays with relatively shallow power-law index of t^(-0.6)."