When will Sirius discover that Sol is gone?

[Agmen of Eladesor]

Assume for the sake of things that Liberty / New York / Manhattan is 700 light years away from Sol.

Sleeper ships leave Sol system this year. How long were they in transit? I don't recall and I didn't see that when I rewatched the intro. But anyway... for purposes of argument, lets say that 5 years (subjective) pass on the ships while they travel, while 50 years (objective) pass in the galaxy. And the Nomads show up to blast Sol 1 year after the sleeper ships leave.

So, the light from Sol going boom would have reached Manhattan 699 years after the sleeper ships left, or 649 years after they arrived there. Or in other words, from game perspective, about 170 years or so ago.

The question actually is - would the regular, average citizen actually care what that funny light was in the sky? And since it wouldn't actually be a supernova, just a big explosion, would it be more than just a quick blink?

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Oh god... The end of days... Agmen agreed with me.