MASTER OT J063100.30+260253.3 outburst YYYYMMDD(UT) mag observer 20181128.7412 <154c (Yutaka Maeda) 20181210.6174 152cG (Yutaka Maeda) 20181212.5942 159c (Yutaka Maeda) 20181214.5786 154cG (Yutaka Maeda) 20181215.5814 <154c (Yutaka Maeda) 20181217.7504 158cG (Yutaka Maeda) 20181218.7362 154cG (Yutaka Maeda)