One of the gamma-rays emitted during the eruption - seen in the constellation Leo - was three times more energetic than any other gamma-ray burst recorded by Fermi's Large Area Telescope (LAT), the instrument on the spacecraft responsible for detecting these kinds of explosions.
The gamma-ray burst (named GRB 130427A) was also the longest ever recorded, NASA officials said.
"The GeV emission from the burst lasted for hours, and it remained detectable by the LAT for the better part of a day, setting a new record for the longest gamma-ray emission from a GRB," NASA officials added.
Gamma-ray bursts are the brightest explosions yet observed in the universe.
"Astronomers think most [gamma-ray bursts] occur when massive stars run out of nuclear fuel and collapse under their own weight," NASA officials said in a statement. "As the core collapses into a black hole, jets of material shoot outward at nearly the speed of light."
Swift's detection of this burst was delayed. The satellite was moving between cosmic targets at the time of the eruption, but the spacecraft captured the explosion less than a minute after it began. Swift also aided astronomers in placing the gamma-ray burst closer to Earth than most other star explosions of its kind, NASA officials said.