Not if they are Gamma Ray Beams
If beam width due to divergence allows only a few days of observation millions of light years away, then within their own galaxy they probably wouldn't hit anything at all. Gamma ray bursts might accompany every supernova, but we would only see the visible and IR flash. The Gamma Ray Beam (GRB) would be pointed a couple millionths of a degree to the left and would completely miss our solar system.