L-1011 Stargazer, Swift Boost Mission IV

Yesterday's launch window was missed again due to a minor glitch that surfaced with the Pegasus rocket but it now seems everything is sorted out. A new attempt will be made today.

From NASA's Swift blog:

After takeoff of the L-1011 aircraft carrying the Pegasus XL, a launch vehicle issue temporarily prevented teams from deploying the rocket.

The launch of Katalyst’s robotic servicing spacecraft LINK, designed to boost the orbit of NASA’s Neil Gehrels Swift Observatory, is now targeting no earlier than 8:35 p.m. UTC+12 (4:35 a.m. EDT), Friday, July 3, on Northrop Grumman’s Pegasus XL rocket from Kwajalein Atoll, Marshall Islands.

From Space.com:

This is the final flight of the historic Pegasus rocket.

An air-launched Northrop Grumman Pegasus XL rocket will soon fly for the very last time, sending a private spacecraft on a rescue mission to save one of NASA's most iconic space telescopes from falling back to Earth.

• Space.com: NASA to launch mission to save Swift telescope

L-1011 Stargazer, Swift Boost Mission III

Mission postponed again due to unfavorable weather conditions:

The launch of Katalyst Space’s robotic servicing spacecraft LINK, designed to boost the orbit of NASA’s Neil Gehrels Swift Observatory, was postponed again Wednesday due to unfavorable weather conditions. The next launch attempt is targeted for no earlier than Thursday, July 2, at 9:09 p.m. UTC+12 (5:09 a.m. EDT), on Northrop Grumman’s Pegasus XL rocket from Kwajalein Atoll, Marshall Islands.

• NASA Science: Weather Delays Launch of Mission to Boost NASA’s Swift

Article by Northrop Grumman: Cockpit to the Cosmos

Cockpit to the Cosmos

With unmatched skill and focus, Northrop Grumman’s Stargazer pilots transform a jetliner into a launch platform.

Stargazer © Northrop Grumman

Northrop Grumman pilots operate the Stargazer L-1011 aircraft to air-launch the Pegasus rocket, enabling precise, flexible deployment of small satellites like NASA’s Swift Observatory, requiring exceptional skill, teamwork, and focus for mission success. 

• Full article: Cockpit to the Cosmos

Swift Boost scrubbed due to weather

Stargazer © NASA/Jamie Adkins

The launch of Katalyst Space’s robotic servicing spacecraft LINK, designed to boost the orbit of NASA’s Neil Gehrels Swift Observatory, was postponed Tuesday due to unfavorable weather conditions. The next launch attempt is targeted for no earlier than Wednesday, July 1, at 9:43 p.m. UTC+12 (5:43 a.m. EDT), on Northrop Grumman’s Pegasus XL rocket from Kwajalein Atoll, Marshall Islands.

• NASA Science: Neil Gehrels Swift Observatory