MGAB-V233 likely superoutburst ER UMa star. Duty cycle appears to be increasing recently. YYYYMMDD(UT) mag observer 20221012.7009 <169C (Masayuki Moriyama) 20221015.6871 154C (Masayuki Moriyama) 20221017.6898 <163C (Masayuki Moriyama) 20221022.7380 15.30C (Masayuki Moriyama) 20221027.6709 152C (Masayuki Moriyama) 20221029.6406 154C (Masayuki Moriyama) 20221030.6280 153C (Masayuki Moriyama) 20221104.6647 15.61C (Masayuki Moriyama) 20221106.6354 156C (Masayuki Moriyama)