This is Icarus. The farthest away single star we've ever seen. It's a blue supergiant star, not a supernova or gamma ray burst or anything, just a star, seen from 9 𝘣𝘪𝘭𝘭𝘪𝘰𝘯 light years away.
We were only able to see it for a time because it was Gravitationally Lensed by passing directly behind another star and then magnified further by other galaxy clusters and dark matter. Spacetime acted like a telescope for this single star, magnifying about 2000 times.