Serendipitous discovery of a projected pair of QSOs separated by 4.5
  arcsec on the sky
  We present the serendipitous discovery of a projected pair of quasi-stellar
objects (QSOs) with an angular separation of $\Delta\theta =4.50$ arcsec. The
redshifts of the two QSOs are widely different: one, our programme target, is a
QSO with a spectrum consistent with being a narrow line Seyfert 1 AGN at
$z=2.05$. For this target we detect Lyman-$\alpha$, \ion{C}{4}, and
\ion{C}{3]}. The other QSO, which by chance was included on the spectroscopic
slit, is a Type 1 QSO at a redshift of $z=1.68$, for which we detect
\ion{C}{4}, \ion{C}{3]} and \ion{Mg}{2}. We compare this system to previously
detected projected QSO pairs and find that only about a dozen previously known
pairs have smaller angular separation.
