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We present the discovery and high-cadence follow-up observations of SN2018ivc, an unusual Type II supernova that exploded in NGC 1068 (D=10.1 Mpc).The light curve of SN 2018ivc declines piecewise-linearly, changing slopefrequently, with four clear slope changes in the first 30 days of evolution.This rapidly changing light curve indicates that interaction between thecircumstellar material and ejecta plays a significant role in the evolution.Circumstellar interaction is further supported by a strong X-ray detection. Thespectra are rapidly evolving and dominated by hydrogen, helium, and calciumemission lines. We identify a rare high-velocity emission-line featureblueshifted at ~7800 km/s (in Ha, Hb, Pb, Pg, HeI, CaII), which is visible fromday 18 until at least day 78 and could be evidence of an asymmetric progenitoror explosion. From the overall similarity between SN 2018ivc and SN 1996al, the\Ha{} equivalent width of its parent HII region, and constraints frompre-explosion archival Hubble Space Telescope images, we find that theprogenitor of SN 2018ivc could be as massive as 52 Msun but is more likely <12Msun. SN 2018ivc demonstrates the importance of the early discovery and rapidfollow-up observations of nearby supernovae to study the physics andprogenitors of these cosmic explosions.

Discovery and Rapid Follow-up Observations of the Unusual Type II SN 2018ivc in NGC 1068