If the GRB is close enough and the jet is pointed directly at us the Earth would be fried.
If it had been as close as the Andromeda Galaxy (1.5 million LT) it would have been more than one billion times as bright, somewhere between the Sun and the Moon.
Of course, one would expect these things to be distributed with a density inversely proportional to the square of the distance, or iow, the relative frequency of occurance is inversely proportional to the relative brightness. (Relative brightness goes as one-on-R-square, volume per unit range goes as R-square.)
If it had been on the further edge of the Milky Way, it would be as bright as the sun.