NASA’s Neil Gehrels Swift Observatory made its final observation on October 20, 2026. In an account published October 23, NASA said the science mission had ended because Swift was orbiting below 275 kilometers, where atmospheric drag kept its telescopes from pointing steadily at astronomical targets.
Why Swift stopped observing
At that low altitude, drag disrupted the steady pointing Swift needed to observe targets. NASA’s account placed the observatory below 275 kilometers when its science mission ended.
The final observation and NASA’s announcement were separate events: Swift’s last observation was on October 20, and NASA reported the mission’s end on October 23.
What happened to the LINK rescue plan
Before Swift’s science mission ended, a planned attempt to capture the observatory and raise its orbit with the LINK spacecraft was abandoned. Earlier reports from Actualidad Aeroespacial and Eureka said LINK had experienced communications and attitude-control problems. The planned capture and orbit boost were not completed.
LINK was a separate spacecraft from Swift. The abandoned rescue objective preceded Swift’s final observation; it was not the event that ended Swift’s science mission.
How Swift tracked gamma-ray bursts
Swift could detect and locate a gamma-ray burst, send its position to other observatories, and turn its telescopes toward the source in about a minute. A gamma-ray burst is a brief burst of high-energy gamma rays; its afterglow can fade quickly, making a fast response valuable. Swift could also schedule up to 75 independent targets a day.
Swift’s scientific record and public archive
NASA says Swift observed more than 2,000 gamma-ray bursts and studied more than 1,400 supernova explosions. Its data contributed to about 7,000 scientific papers.
One milestone came in May 2005, when Swift detected 11 X-ray photons from the afterglow of GRB 050509B, a 0.03-second short gamma-ray burst. NASA identifies it as the first short burst with a detected afterglow.
Swift’s publicly available archive contains about 12 terabytes of data, including more than 1.5 million images from its Ultraviolet/Optical Telescope. The archive preserves a substantial record for researchers to use after the spacecraft’s observing mission.
NASA’s plans for rapid-response astronomy
In its October 23 account, NASA forecast that Swift would reenter Earth’s atmosphere within the next few weeks. NASA also said it was exploring ways to respond rapidly to cosmic events using existing space telescopes, commercial fast-to-orbit capabilities, and future missions.
