Supernovae: how far away should one be?

Consider the 1987 supernova.

1) From what minimum distance would the prudent astronaut view such an
event?

2) At what distance from the earth would that supernova have lit up the
night side of the planet to more or less the same brightness as the sun?
And would there have been sufficient radiation outside the visible band
to have caused damage to life?

Cheers,

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Tim