Is it possible we've found the first white hole? - io9: A gamma ray burst back in 2006 didn't fit with our understanding of where they come from - its long duration (102 seconds) meant that it had to be created in a supernova explosion, and yet there were no supernovas there for it to have come from. Its discoverers actually said that "this is brand new territory; we have no theories to guide us."
Now, five years later, it's being suggested that we might actually have caught sight of a white hole. The fierceness and duration of the explosion could well fit with a white hole briefly popping into existence, spewing out some matter, and then quickly collapsing into itself, resulting in this massive explosion.