Death by gamma ray burst
So just how bad would a direct hit be?
I heard somewhere that the effects would be remarkably similar to a 1kt nuclear detonation per square mile (ie bad) but not clear just what the long term consequences might be.
Would the Earth be completely sterilized or would it be more like a Permian extinction level event?
On the flip side, no more whining about Brexit, or anything else for a good 100M years.