A precursor interpretation for the Crab supernova 1054 A.D. very early light curve

In spite that the Crab supernova in 1054 A.D. was studied over years, it is still not clear what type of event produced explosion. The most detailed and reliable source observed light curve recorded Chinese Japanese chronicles, suggests a quick dimming after very bright initial peak. We shall show this work can be well explained by precursor, phenomenon emerging from large sampling quite expected Stellar Evolution considerations low-mass progenitors. This early transient followed explosion itself, likely low-luminosity ``small iron core'' instead an electron-capture event. latter conclusion stems recent simulation work, which predict would render magnitude to much brighter for $\sim 3$ months, hence visible during daytime, match records.