NASA Ends 22-Year Swift Observatory Mission as Orbit Decays

NASA announced the retirement of the Neil Gehrels Swift Observatory, a space telescope launched in November 2004 to study gamma-ray bursts and other transient cosmic events. Originally planned for a two-year mission, Swift operated for almost 22 years, recording more than 2,000 gamma-ray bursts and monitoring over 1,400 supernovae, contributing to thousands of scientific papers.

The spacecraft’s orbit gradually lowered due to atmospheric drag, and after an unsuccessful orbit-boost attempt earlier this year, it descended below 171 miles in late October. At that altitude the satellite could no longer maintain stable flight, entered safe mode, and ground controllers issued a final shutdown command.

"Swift delivered a lasting return on investment for the nation, designed for a two-year primary mission but productive for more than 10 times as long," said Shawn Domagal-Goldman, director of the Astrophysics Division at NASA Headquarters.

"In that time, Swift played a major role in advancing our understanding of the changing universe and was part of a revolution in astrophysics that showed how critical rapid-response observations are to the entire community," Domagal-Goldman added.

"Swift was designed as a satellite dedicated to studying gamma-ray bursts, outbursts that came and went so quickly that no one could target them with large telescopes to learn more," said S. Bradley Cenko, the mission’s principal investigator at NASA’s Goddard Space Flight Center.

"Swift needed to detect and locate gamma-ray bursts, communicate their position to other observatories, and then swing its telescopes around to image the burst locations before their afterglows faded out. This typically took Swift about a minute to do," Cenko explained.

NASA indicated that the satellite is expected to re-enter Earth’s atmosphere safely in the coming weeks, leaving an extensive archive of multi-wavelength observations for future research.