Maybe specific Gamma Ray Bursts close by, in general we've already seen at least 16 GRB's in the lifespan of the early Vela satellites and survived those just f

Maybe specific Gamma Ray Bursts close by, in general we've already seen at least 16 GRB's in the lifespan of the early Vela satellites and survived those just fine. There are a few books on the subject: eg. https://books.google.com.au/books?id=6mGGX6AGBTAC https://books.google.com.au/books?id=6mGGX6AGBTAC I'd venture the biggest threat of a GRB not dampened by distance would be the explosive event that caused a sun to release as much energy in a few seconds as our Sun will in its entire 10-billion-year lifetime.