Credit: NASA
The Neil Gehrels Swift Observatory: Decades of Discovery
Gamma-ray bursts are the most energetic events we can observe today. GRBs are brief, intense flashes of high-energy radiation from space, and for years were one of astronomy's biggest mysteries. First observed in July 1969 (but first reported in 1973), GRBs remained mysterious for many years, because these brief, intense flashes of Gamma-rays are hard to localize in space. Understanding GRBs requires the capability of near-simultaneous observations at Gamma-ray, X-ray and optical wavelengths. NASA's Neil Gehrels Swift space observatory, shown above, is the workhorse space observatory for tracking and studying GRBs. Launched on November 20, 2004, Swift includes three telescopes, one operating in the Gamma-ray range, one in the X-ray range, and one in the optical and ultraviolet. The Gamma-ray detector, the Burst Alert Telescope, provides detection and localization of Gamma-ray bursts in a wide field of view by using the Gamma-ray shadows cast by a burst. Once found by the BAT, Swift can rapidly slew to put the source in the field of the X-ray Telescope and the UV and Optical Telescope, to measure the afterglows of the burst at those energies, and to provide an accurate position for subsequent follow-up by Swift and other space- and ground-based telescopes. In its more than two decades of operation, Swift has revolutionized our understanding of GRBs, and demonstrated that GRBs are associated with the formation of black holes, either through the collapse of massive stars or the merging of neutron stars. But after two decades, the tug of earth's atmosphere on Swift has taken its toll, causing the orbit to decay.
But NASA put together a daring plan to rescue Swift. On July 3, NASA and Katalyst Space Technologies launched America's first commercial space robot, called LINK, to rendezvous with Swift and boost the observatory to a higher orbital altitude. But space is hard, and despite this heroic effort, an ongoing issue with the attitude control system on the LINK spacecraft has prevented LINK from catching and boosting Swift. While this attempt marks a major milestone for future robotic servicing of spacecraft, Swift will likely re-enter the atmosphere sometime later this year, marking an end to its historic mission. Mission planners are now prioritizing Swift's final science observations; who knows what ground-breaking discoveries they may yet reveal?
Published: August 24, 2026
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Page Author: Dr. Michael F. Corcoran
Last modified Sunday, 23-Aug-2026 10:04:12 EDT