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Wang","submitted_at":"2018-01-08T09:21:46Z","abstract_excerpt":"We present extensive ultraviolet (UV) and optical photometry, as well as dense optical spectroscopy for type II Plateau (IIP) supernova SN 2016X that exploded in the nearby ($\\sim$ 15 Mpc) spiral galaxy UGC 08041. The observations span the period from 2 to 180 days after the explosion; in particular, the Swift UV data probably captured the signature of shock breakout associated with the explosion of SN 2016X. It shows very strong UV emission during the first week after explosion, with contribution of $\\sim$ 20 -- 30% to the bolometric luminosity (versus $\\lesssim$ 15% for normal SNe IIP). 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