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The "imminent" event actually took place 1.2 billion years ago, which is how many light years away the the galaxy in question is (SDSSJ1430+2303).

Depends on your frame of reference.

When did the Big Bang happen?

Am I an uncaptured photon?

If we observe that photon, the cat will be dead.

Now

The Big Bang happened right here. (And everywhere else as well.) That's the difference.

came here to find out how far away from us this is

1.2 bn light years sounds like safe distance ..is it?

Cue the female robot voice, "You now have 100 days to reach minimum safe distance"