Comment Huh? (Score 1) 237
GRBs clearly haven't prevented life in *our* galaxy, so the Fermi Paradox still stands.
The caluculations probably rule out life in the core of our galaxy, but systems further out would be exposed even less often than ours is. And even though GRBs can periodically sterilize a planet, their directionality means that one burst would not likely sterilize all the planets in an intercellar civilization simultaneously.
So, to modify what someone said above, we can add another term to the Drake equation, but this doesn't do much to answer Fermi.