MUSSES2020J: The Earliest Discovery of a Fast Blue Ultraluminous Transient at Redshift 1.063

Ji An Jiang, Naoki Yasuda, Keiichi Maeda, Nozomu Tominaga, Mamoru Doi, Å1/2eljko Ivezić, Peter Yoachim, Kohki Uno, Takashi J. Moriya, Brajesh Kumar, Yen Chen Pan, Masayuki Tanaka, Masaomi Tanaka, Ken'Ichi Nomoto, Saurabh W. Jha, Pilar Ruiz-Lapuente, David Jones, Toshikazu Shigeyama, Nao Suzuki, Mitsuru KokuboHisanori Furusawa, Satoshi Miyazaki, Andrew J. Connolly, D. K. Sahu, G. C. Anupama