GZ Cnc possible superoutburst YYYYMMDD(UT) mag observer 20180130.6091 <157c (Yutaka Maeda) 20180201.6312 <139c (Yutaka Maeda) 20180202.7127 <159c (Yutaka Maeda) 20180207.517 130 (Rod Stubbings) 20180207.6223 131c (Yutaka Maeda)