Raoul is quite right.
There is no danger to Earth from
a supernova exploding 10,000 L-Y away.
A supernova would have to occur less
than 200 L-Y away for Earth's atmosphere to be seriously affected.
We'll be OK!

Incidently! Did some number-crunching.
That supernova seen in 1987 that occurred in the SMC, more than 160,000 L-Y away
definitely reached a naked-eye visible magnitude of at least 4.
So, when that star 10,000 L-Y away
goes SN, it will be at least 16^2 brighter
[256].
And since 256 is roughly 6 magnitudes
brighter. Than that star 10,000 L-Y away
should easily reach -2 magnitude
[brighter than Sirius, brighter than Jupiter].

Jacob