In March 2008, one burst (GRB 080319B) was so bright that you would have been able to see it with the naked eye for 30 seconds. Despite a redshift of 0.937. Let’s put that into perspective — because of the way redshifts work, a redshift of 1 can be considered to be about halfway across the observable Universe. Loosely 7.5 billion light years away. This GRB was half a Universe away and visible to the naked eye! Incredible.