Swift’s science mission ends after more than 20 years

NASA’s Neil Gehrels Swift Observatory ended science observations after making its final observation on Oct. 20, 2026. The spacecraft had descended to about 171 miles (275 kilometers) above Earth and entered safe mode, unable to compensate for increased atmospheric drag well enough to keep its observations steady, NASA said.

NASA announced the end of the mission on Oct. 23. The observatory had not re-entered Earth’s atmosphere at that point. NASA expected re-entry in the next few weeks but had not announced a date or location.

Swift was designed for a two-year primary mission and remained productive for more than 10 times that duration. Put another way, NASA’s comparison means it operated for more than 20 years against an initial two-year plan. The mission’s final observation came as its orbit decayed and the spacecraft could no longer sustain the conditions needed for science observations.

NASA attributed some of the increased atmospheric drag to recent solar activity. The agency also said Swift’s return to science observations had increased drag. The operations team at Penn State in University Park, Pennsylvania, sent the command that ended operations.

Researchers can still use Swift’s archive i

Can researchers continue working with Swift data? Yes. The spacecraft has stopped collecting observations, but NASA says its public archive remains available. That distinction matters: researchers can study measurements Swift already recorded, but the observatory can no longer respond to newly occurring events.

The archive contains nearly 22 years of brightness measurements, more than 1.5 million images from the Ultraviolet/Optical Telescope and about 12 terabytes of data. Those figures describe different parts of the collection: a long span of measurements, a large image set and the archive’s overall data volume.

Swift observed more than 2,000 gamma-ray bursts and studied more than 1,400 supernova explosions. NASA says data from the observatory contributed to about 7,000 published scientific papers. The archive preserves those observations for continued research even though Swift can no longer make new ones.

NASA plans to use current missions for rapid response i

Swift’s end removes its rapid-response observing capability. NASA says it will use current missions to help cover that gap while exploring ways to use or augment its fleet and other capabilities. The agency has not announced a finalized long-term replacement.

For now, the practical change is clear: Swift will not observe new cosmic events, while its existing public data remains available. Re-entry is still expected in the coming weeks, with no specific date or location announced as of NASA’s Oct. 23 update.