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The M 31 nova M31N 2008-12a was recently found to be a recurrent nova (RN)with a recurrence time of about 1 year. This is by far the fastest recurrencetime scale of any known RNe. Our optical monitoring programme detected thepredicted 2014 outburst of M31N 2008-12a in early October. We immediatelyinitiated an X-ray/UV monitoring campaign with Swift to study themultiwavelength evolution of the outburst. We monitored M31N 2008-12a withdaily Swift observations for 20 days after discovery, covering the entiresupersoft X-ray source (SSS) phase. We detected SSS emission around day sixafter outburst. The SSS state lasted for approximately two weeks until aboutday 19. M31N 2008-12a was a bright X-ray source with a high blackbodytemperature. The X-ray properties of this outburst were very similar to the2013 eruption. Combined X-ray spectra show a fast rise and decline of theeffective blackbody temperature. The short-term X-ray light curve showedstrong, aperiodic variability which decreased significantly after about day 14.Overall, the X-ray properties of M31N 2008-12a are consistent with the averagepopulation properties of M 31 novae. The optical and X-ray light curves can bescaled uniformly to show similar time scales as those of the Galactic RNe U Scoor RS Oph. The SSS evolution time scales and effective temperatures areconsistent with a high-mass WD. We predict the next outburst of M31N 2008-12ato occur in autumn 2015.

A remarkable recurrent nova in M 31: The predicted 2014 outburst in X-rays with Swift