NASA satellites have found a second super-sized black hole at the heart of an unusual nearby galaxy already known to be sporting one.
After two years of painstaking analysis, astronomers say a stellar blast observed by Swift was the farthest explosion yet identified.
On Dec. 11, 2010,asteroid Scheila flared twice as bright as expected. Hubble and Swift captured the aftermath of this deep space collision.
A new supercomputer simulation gives the most detailed view of the forces driving some of the universe's most energetic explosions.
Usually, gamma-ray bursts last hours, marking the destruction of a massive star, but three telescopes have now zoomed in on one lasting for days.
An international team of scientists using data from NASA's Swift satellite confirms the existence of a largely unseen population of black-hole-powered galaxies.
Swift primarily studies gamma-ray bursts, the biggest and most mysterious explosions in the cosmos. On April 13, Swift's "burst-o-meter" cataloged its 500th GRB.
Astronomers have found evidence that two supernovae blasts received an extra boost from newborn black holes.
A specialized camera on a telescope operated by U.K. astronomers from Liverpool has made the first measurement of magnetic fields in the afterglow of a gamma-ray burst (GRB).
Astronomers at NASA's Goddard Space Flight Center find that an X-ray source in galaxy NGC 5408 represents one of the best cases for a middleweight black hole to date.
In a break from its usual task of searching for distant cosmic explosions, NASA's Swift satellite has acquired the highest-resolution view of a neighboring spiral galaxy ever attained in the ultraviolet.
NASA's Swift satellite detected a rare interstellar object known as a soft gamma repeater, or SGR. The object is only the fifth confirmed SGR.
NASA's Swift satellite and an international team of astronomers have found a gamma-ray burst from a star that died when the universe was only 630 million years old.
A montage of comet images made using NASA’s Swift spacecraft illustrates just how different three comets can be.
While waiting for high-energy outbursts and cosmic explosions, NASA's Swift Gamma-ray Explorer satellite is monitoring Comet Lulin as it closes on Earth.
Astronomers using NASA's Swift satellite and Fermi Gamma-ray Space Telescope are seeing frequent blasts from a stellar remnant 30,000 light-years away.
Astronomers have, for the first time, identified gas molecules in the host galaxy of a gamma-ray burst.
An ongoing X-ray survey undertaken by NASA's Swift spacecraft is revealing differences between nearby active galaxies and those located about halfway across the universe.
Swift caught sight of a splintered comet fragment as it passed by the Ring Nebula.
Astronomers are reporting on a strange case where one of the littlest of stars "twinkled" with gamma rays, X-rays, and light -- and then vanished.