The Neil Gehrels Swift Observatory

The Neil Gehrels Swift Observatory

Swift satellite artists conception Gamma-ray bursts (GRBs) are the most powerful explosions the Universe has seen since the Big Bang. They occur approximately once per day and are brief, but intense, flashes of gamma radiation. They come from all different directions of the sky and last from a few milliseconds to a few hundred seconds. So far scientists do not know what causes them. Do they signal the birth of a black hole in a massive stellar explosion? Are they the product of the collision of two neutron stars? Or is it some other exotic phenomenon that causes these bursts?

With Swift, a NASA mission with international participation, scientists have a tool dedicated to answering these questions and solving the gamma-ray burst mystery. Its three instruments give scientists the ability to scrutinize gamma-ray bursts like never before. Within seconds of detecting a burst, Swift relays its location to ground stations, allowing both ground-based and space-based telescopes around the world the opportunity to observe the burst's afterglow. Swift is part of NASA's medium explorer (MIDEX) program and was launched into a low-Earth orbit on a Delta 7320 rocket on November 20, 2004. The Principal Investigator is Dr. Brad Cenko (NASA-GSFC).

NASA's Swift Studies Gas-Churning Monster Black Holes
NASA's Swift Studies Gas-Churning Monster Black Holes
Scientists using observations from NASA's Neil Gehrels Swift Observatory have discovered, for the first time, the signal from a pair of monster black holes disrupting a cloud of gas in the center of a galaxy.

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Swift's 20th Anniversary
Swift's 20th Anniversary

Swift Operations Status

Swift has suspended science observations to prioritize orbital lifetime in support of the reboost mission.

Latest Swift News

Jul 15, 2026

Spacecraft Commissioning On Track for Mission to Boost NASA's Swift

Teams continue to progress through in-orbit preparations for the robotic servicing spacecraft designed to boost NASA's Neil Gehrels Swift Observatory to a higher altitude. Katalyst Space's LINK spacecraft remains healthy and is about halfway through this commissioning process.
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Jul 10, 2026

On-Orbit Checkouts in Progress for Mission to Boost NASA's Swift

Commissioning is well underway for Katalyst's robotic servicing spacecraft LINK, which is designed to boost the orbit of NASA's Neil Gehrels Swift Observatory.
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Jul 3, 2026

Mission To Boost NASA's Swift Launches From Marshall Islands

A mission to raise the altitude of NASA's Neil Gehrels Swift Observatory is underway after launching at 8:36 p.m. Marshall Islands Time (4:36 a.m. EDT), Friday, July 3, from Kwajalein Atoll in the South Pacific Ocean.
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