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