largest supernova ever observed

Question: If / when Carinae goes like this, what will happen to earth? Any consequences?

Probably won't be aimed at the Solar System.

NASA: Ask an Astrophysicist

See also
"Record-breaking stellar event" discovered by Chandra
Supernova 2006gy
Universe Today: Chandra Sees the Brightest Supernova

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0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 0 1 1 0 1 0 0 1 0 1 1 0 1 0 0 1 1 0 0 1 0 1 1 0 ...

Without bothering to look. . . Eta Carina goes we are not in any danger.
It will be bright and worth the interest.

If true, I would like to see it happen tomorrow

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If everyone had even a basic grasp of scientific principles, this planet would be a better place (Phil Plait)

Die Lücke, die wir hinterlassen, ersetzt uns vollkommen (Carl Heinz Schroth)

1 + e^i*pi = 0

It's been fairly active now for over 100 yrs (that we know of). Whether it's 1, 2 or possibly even 3 very massive stars isn't know for sure (or at least wasn't a few years ago). Hopefully, it is as far away as we think it is and that it will have a grb beam axis aimed significantly away from our direction. Suffice to say that if these aren't valid assumptions, it would be a bad day to be visiting the ISS when(if) that monster blows its cork. And our first notice of the event would be satellite gamma ray measurements trying to go off the scale.