Not a "Fwoop"
More like a FwoKABOOOMp
The energy involved is enough to literally warp the mind as well as the fabric of spacetime.
If you thought Tsar Bomba was big, think again.
On the flip side, if we were within maybe a few hundred light years the resulting mayhem would not be a major concern as
everything biological on this planet would be converted into chunky salsa, though the fabric of the planet might survive the extinction
would likely be worse than the Ordovician.
Gamma ray burst would actually do less damage as it would merely obliterate everything on the side of the planet facing it, assuming
that deep sea life survived the resultant firestorm then in a few hundred million years life would re-emerge onto land.