Editing Neil Gehrels Swift Observatory (section)

=== Ultraviolet/Optical Telescope (UVOT) ===
[[File:M101 combined low.jpg|thumb|upright=1.0|left|UVOT's "[[first light (astronomy)|first light]]" image]]

After Swift has slewed towards a GRB, the [[Ultraviolet/Optical Telescope|UVOT]] is used to detect an optical afterglow. The UVOT provides a sub-arcsecond position and provides optical and ultra-violet photometry through lenticular filters and low resolution spectra (170–650&nbsp;nm) through the use of its optical and UV [[grism]]s. The UVOT is also used to provide long-term follow-ups of GRB afterglow lightcurves. The UVOT is based on the [[XMM-Newton]]'s Optical Monitor (OM) instrument, with improved optics and upgraded onboard processing computers.<ref>{{cite web |url=http://swift.gsfc.nasa.gov/docs/swift/about_swift/uvot_desc.html|title=Swift's Ultraviolet/Optical Telescope (UVOT)|publisher=NASA|date=December 14, 2006|access-date=May 2, 2009}} {{PD-notice}}</ref>

On 9 November 2011, UVOT photographed the asteroid [[(308635) 2005 YU55|2005 YU55]] as the [[asteroid]] made a close flyby of the [[Earth]].<ref>{{cite web|url=https://svs.gsfc.nasa.gov/vis/a010000/a010800/a010871/|title=Swift Captures Flyby of Asteroid 2005 YU55|publisher=NASA|date=November 11, 201|access-date=November 22, 2011|archive-date=5 March 2016|archive-url=https://web.archive.org/web/20160305021416/http://svs.gsfc.nasa.gov/vis/a010000/a010800/a010871/|url-status=dead}} {{PD-notice}}</ref>

On 3 June 2013, UVOT unveiled a massive ultraviolet survey of the nearby [[Magellanic Clouds]].<ref>{{cite web|url=https://www.nasa.gov/mission_pages/swift/bursts/magellanic-uv.html|title=NASA's Swift Produces Best Ultraviolet Maps of the Nearest Galaxies|publisher=NASA|date=June 3, 2013}} {{PD-notice}}</ref>

In August 2017, UVOT imaged UV emissions from gravitational wave event [[GW170817]] detected by LIGO & Virgo detectors.<ref>[https://www.nasa.gov/press-release/nasa-missions-catch-first-light-from-a-gravitational-wave-event ''NASA Missions Catch First Light from a Gravitational-Wave Event'' 2017] {{PD-notice}}</ref><ref name="Evans2017"/>