It is know that SN 1006 (Lupus Constellation, southern hemisphere) is the bightest (-7.5 at peak) observed by naked eyes. Brigther than Venus (SN 1054 - formed Crab Nebula M1 also), seen for a few months during day time. Some would even claim one could read under its peak brightness at night. Source: the History of Supernova by Wikipedia.
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