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We present photometric and spectroscopic observations of ASASSN-13co, anunusually luminous Type II supernova and the first core-collapse supernovadiscovered by the All-Sky Automated Survey for SuperNovae (ASAS-SN). Firstdetection of the supernova was on UT 2013 August 29 and the data presented spanroughly 3.5 months after discovery. We use the recently developed model fromPejcha & Prieto (2015) to model the multi-band light curves of ASASSN-13co andderive the bolometric luminosity curve. We compare ASASSN-13co to other Type IIsupernovae to show that it was unusually luminous for a Type II supernova andthat it exhibited an atypical light curve shape that does not cleanly matchthat of either a standard Type II-L or Type II-P supernova.

Discovery and Observations of the Unusually Luminous Type-Defying II-P/II-L Supernova ASASSN-13co