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In 2006 February, shortly after its launch, Swift began monitoring the centerof the Milky Way with the onboard X-Ray Telescope using short 1-ks exposuresperformed every 1-4 days. Between 2006 and 2014, over 1200 observations havebeen obtained, amounting to ~1.2 Ms of exposure time. This has yielded a wealthof information about the long-term X-ray behavior of the supermassive blackhole Sgr A*, and numerous transient X-ray binaries that are located within the25'x25' region covered by the campaign. In this review we highlight thediscoveries made during these first nine years, which includes 1) the detectionof seven bright X-ray flares from Sgr A*, 2) the discovery of the magnetar SGRJ1745-29, 3) the first systematic analysis of the outburst light curves andenergetics of the peculiar class of very-faint X-ray binaries, 4) the discoveryof three new transient X-ray sources, 5) exposing low-level accretion inotherwise bright X-ray binaries, and 6) the identification of a candidate X-raybinary/millisecond radio pulsar transitional object. We also reflect on futurescience to be done by continuing this Swift's legacy campaign of the Galacticcenter, which includes high-cadence monitoring of how the interaction betweenthe gaseous object `G2' and Sgr A* plays out in the future.

The Swift X-ray monitoring campaign of the center of the Milky Way