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V745 Sco is a recurrent nova, with the most recent eruption occurring inFebruary 2014. V745 Sco was first observed by Swift a mere 3.7 hr after theannouncement of the optical discovery, with the super-soft X-ray emission beingdetected around four days later and lasting for only ~two days, making it boththe fastest follow-up of a nova by Swift and the earliest switch-on ofsuper-soft emission yet detected. Such an early switch-on time suggests acombination of a very high velocity outflow and low ejected mass and, togetherwith the high effective temperature reached by the super-soft emission, a highmass white dwarf (>1.3 M_sun). The X-ray spectral evolution was followed froman early epoch where shocked emission was evident, through the entirety of thesuper-soft phase, showing evolving column density, emission lines, absorptionedges and thermal continuum temperature. UV grism data were also obtainedthroughout the super-soft interval, with the spectra showing mainly emissionlines from lower ionization transitions and the Balmer continuum in emission.V745 Sco is compared with both V2491 Cyg (another nova with a very shortsuper-soft phase) and M31N 2008-12a (the most rapidly recurring nova yetdiscovered). The longer recurrence time compared to M31N 2008-12a could be dueto a lower mass accretion rate, although inclination of the system may alsoplay a part. Nova V745 Sco (2014) revealed the fastest evolving super-softsource phase yet discovered, providing a detailed and informative dataset forstudy.

Swift detection of the super-swift switch-on of the super-soft phase in nova V745 Sco (2014)