WEBT observations are done at the Sobaek Telescope by the blazar research group of the Korea Astronomy & Space Science Institute. The group members are Chung-Uk Lee (leecu@kao.re.kr), Hong-Suh Yim (yimhs@kao.re.kr), Soojong Pak (soojong@kao.re.kr), and Bong-Won Sohn (bwsohn@trao.re.kr).
Telescope parameters: Long=+128 27 27.36, Lat=+36 56 03.89, Alt=1377.99m
Optical configuration: D=0.6 m, f/13.5
CCD camera: Roper, SiTe 2K*2K*24um, LN2 cooling, 20’*20′ field coverage
Filters: Johnsons U B V and Cousins R I