$\begin{figure} \par\resizebox{18cm}{!}{\rotatebox[]{0}{\includegraphics[clip=tru... ...20303.1-074154}} \put(-101,94){\tiny {XMMSL1 J024916.6-041244}} \end{figure}$ Figure 1: Positions of slew sources (red circles) presented in Table 1 overplotted on DSS images of side 2 arcmin. The radius of the circles has been fixed to 8 arcsec, which is the astrometric uncertainty of the slew sources. Offsets between 2 and 6 arcsec have been found for all galaxy counterparts except a 12 arcsec offset for 2MASX J02491731-0412521, whose identification is unambiguous as no other source lies nearby.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{6072fig7.ps} \end{figure}$ Figure 3: Optical spectrum of SDSS J132341.97+482701.3 performed seven months before the corresponding slew exposure.
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{6072fig8.ps} \end{figure}$ Figure 4: Optical spectra of 2MASX J02030314-0741514, 2MASX J02491731-0412521 and SDSS J093922.90+370944.0 ( from top to bottom).
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In the text

$\begin{figure} \par\includegraphics[width=8.2cm,clip]{6072fig6.eps} \end{figure}$	Figure 2: EPIC-pn X-ray spectrum of NGC 3599. The arrow shows the upper limit above 0.8 keV.
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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{6072fig7.ps} \end{figure}$	Figure 3: Optical spectrum of SDSS J132341.97+482701.3 performed seven months before the corresponding slew exposure.
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$\begin{figure} \par\includegraphics[width=8.2cm,clip]{6072fig8.ps} \end{figure}$	Figure 4: Optical spectra of 2MASX J02030314-0741514, 2MASX J02491731-0412521 and SDSS J093922.90+370944.0 ( from top to bottom).
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