Launch of Swift Boost mission delayed after rocket issue

NASA’s Swift Boost mission was delayed again after a software issue forced a launch-day abort, extending the pressure on a rescue effort meant to raise the orbit of the Neil Gehrels Swift Observatory.

NASA said the problem was fixed and that another launch attempt was planned for Friday, but the latest reports did not include a new launch time. The mission had already slipped earlier in the week because of poor weather, leaving the team with less room to maneuver as Swift continues to lose altitude.

What happened

According to the Associated Press, Northrop Grumman’s plane had already taken off from the Marshall Islands when the software issue triggered the abort. NASA later said the issue had been corrected and that the next attempt would be made Friday.

The launch-day problem came after a weather-related delay earlier in the week. That sequence pushed the mission into a narrower and more uncertain window, even though officials said the rescue effort itself is still alive.

What Swift Boost is trying to do

Swift Boost is designed to use Katalyst Space Technologies’ LINK spacecraft to rendezvous with Swift and gradually raise the observatory’s orbit. The spacecraft is flying aboard Northrop Grumman’s Pegasus XL air-launched rocket.

NASA contracted Katalyst for the mission in September 2025 at a cost of $30 million. The project is being watched closely because it is both a rescue attempt for a valuable science observatory and a test of commercial satellite-servicing capability.

NASA has said Swift has been losing altitude because of increased atmospheric drag linked to solar activity. The agency also paused Swift science operations earlier this year to help preserve the observatory’s orbit while the boost mission was prepared.

Why the mission matters

Swift, officially the Neil Gehrels Swift Observatory, has been a key astrophysics observatory since its launch in 2004, especially for gamma-ray burst and transient-event science. The rescue effort reflects both its scientific value and the risk of losing a still-useful spacecraft to reentry.

The stakes are unusually high because the mission is meant to keep Swift in service rather than simply study it from afar. If successful, LINK would have to separate cleanly from the rocket and begin rendezvous operations with the observatory before the orbit decays further.

There is also symbolic weight around the launch vehicle itself. Pegasus XL is described as being on its final flight, adding another layer of attention to a mission already being watched as a first-of-its-kind commercial salvage effort.

What comes next

The immediate question is whether NASA and its partners keep the Friday retry or slip again. Any additional delay would put more pressure on the remaining orbital margin for Swift.

If the launch proceeds, the next critical steps will be separation, rendezvous and the start of the orbit-raising sequence. If more technical issues emerge, the timetable for the rescue mission could tighten quickly.

For now, the mission remains active, but the calendar is moving against it.