SDSS J100515.39+191108.0 superoutburst following precursor Some observations in 2009. More data are still desired. YYYYMMDD(UT) mag observer 20181128.7901 <138c (Yutaka Maeda) 20181214.8093 136cG (Yutaka Maeda) precursor 20181217.8198 <158c (Yutaka Maeda) 20181224.7568 125cG (Yutaka Maeda)