R-band photometry of SBS1520+530

We present optical R-band light curves of the gravitationally lensed quasar SBS 1520+530 derived from data obtained at the Nordic Optical Telescope, from February 1999 to May...本工作呈现了引力透镜类星体SBS 1520+530的光学R波段光变曲线，该曲线基于北欧光学望远镜（Nordic Optical Telescope）于1999年2月至5月……期间获取的观测数据推导所得。