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First Release of High-Redshift Superluminous Supernovae from the Subaru HIgh- <i>Z</i> SUpernova CAmpaign (SHIZUCA). I. Photometric Properties

First Release of High-Redshift Superluminous Supernovae from the Subaru HIgh- <i>Z</i> SUpernova CAmpaign (SHIZUCA). I. Photometric Properties

We report our first discoveries of high-redshift supernovae from the Subaru HIgh-Z sUpernova CAmpaign, the transient survey using Subaru/Hyper Suprime-Cam (HSC). We report the discovery of three supernovae at the spectroscopically confirmed redshifts of 2.399 (HSC16adga), 1.965 (HSC17auzg), and 1.851 (HSC17dbpf), and two supernova candidates with the host galaxy photometric …