Discovery of Two New Pulsars in 47 Tucanae (NGC 104)
  We report the discovery of two new millisecond pulsars (PSRs J0024$-$7204aa
and J0024$-$7204ab) in the globular cluster 47\,Tucanae (NGC 104). Our results
bring the total number of pulsars in 47\,Tucanae to 25. These pulsars were
discovered by reprocessing archival observations from the Parkes radio
telescope. We reprocessed the data using a standard search procedure based on
the PRESTO software package as well as using a new method in which we
incoherently added the power spectra corresponding to $\sim$1100\,hr of
observations. The newly discovered PSR~J0024$-$7204aa, has a pulse frequency of
$\rm \sim$541\,Hz (corresponding to a $\rm \sim$1.84 ms period), which is
higher than any other pulsars currently known in the cluster and ranks
12$^{\rm{th}}$ amongst all the currently known pulsars. The dispersion measure
of this pulsar, 24.941(7)\,cm$^{-3}$ pc, is the highest in the cluster. The
second discovered pulsar, PSR~J0024$-$7204ab, is an isolated pulsar with a
pulse frequency of $\rm \sim$270\,Hz (corresponding to a period of $\rm
\sim$3.70 ms).
