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We report our multiwavelength study of the 2011 outburst evolution of thenewly discovered black hole candidate X-ray binary Swift J1357.2-0933. Weanalysed the Swift X-ray telescope and Ultraviolet/Optical telescope (UVOT)data taken during the ~7 months duration of the outburst. It displayed a 2-10keV X-ray peak luminosity of ~1E35(D/1.5 kpc)^2 erg s-1 which classifies thesource as a very faint X-ray transient. We found that the X-ray spectrum at thepeak was consistent with the source being in the hard state, but it softenedwith decreasing luminosity, a common behaviour of black holes at lowluminosities or returning to quiescence from the hard state. The correlationsbetween the simultaneous X-ray and ultraviolet/optical data suggest a systemwith a black hole accreting from a viscous disc that is not irradiated. TheUVOT filters provide the opportunity to study these correlations up toultraviolet wavelengths a regime so far unexplored. If the black hole nature isconfirmed, Swift J1357.2-0933 would be one of the very few established blackhole very-faint X-ray transients.

Multiwavelength spectral evolution during the 2011 outburst of the very faint X-ray transient Swift J1357.2-0933