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In an attempt to catch new X-ray transients while they are still bright, thedata taken by XMM-Newton as it slews between targets is being processed andcross-correlated with other X-ray observations as soon as the slew data appearsin the XMM-Newton archive.  A bright source, XMMSL1 J070542.7-381442, was detected on 9 Oct 2007 at aposition where no previous X-ray source had been seen. The XMM slew data andoptical data acquired with the Magellan Clay 6.5m telescope were used toclassify the new object.  No XMM slew X-ray counts are detected above 1keV and the source is seen to be~750 times brighter than the ROSAT All-Sky Survey upper limit at that position.The normally m(V)~16 star, USNO-A2.0 0450-03360039, which lies 3.5" from theX-ray position, was seen in our Magellan data to be very much enhanced inbrightness. Our optical spectrum showed emission lines which identified thesource as a nova in the auroral phase. Hence this optical source is undoubtedlythe progenitor of the X-ray source - a new nova (now also known as V598 Pup).The X-ray spectrum indicates that the nova was in a super-soft state (withkT(eff)~35eV). We estimate the distance to the nova to be ~3kpc. Analysis ofarchival robotic optical survey data shows a rapid decline light curveconsistent with that expected for a very fast nova.  The XMM-Newton slew data present a powerful opportunity to find new X-raytransient objects while they are still bright. Here we present the first suchsource discovered by the analysis of near real-time slew data.

XMM-Newton slew survey discovery of the nova XMMSL1 J070542.7-381442 (V598 Pup)