MASTER OT J172758.09+380021.5 likely superoutburst

Unusual ER UMa-like object. See also https://arxiv.org/abs/2304.07695

YYYYMMDD(UT) mag observer 20230416.6745 <149c (Yutaka Maeda) 20230416.8091 <145C (Masayuki Moriyama) 20230417.4991 17.983g (ASAS-SN Sky Patrol Photom. DB (Hart+2023; Shappee+2014)) 20230417.6905 <154c (Yutaka Maeda) 20230421.7121 <157c (Yutaka Maeda) 20230422.6860 <160c (Yutaka Maeda) 20230426.6738 145cG (Yutaka Maeda) 20230426.7837 147C (Masayuki Moriyama)