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 \sim 541 Hz ( corresponding to a \sim 1.84 ms period ) , which is higher than any other pulsars currently known in the cluster and ranks 12 ^ { 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 \sim 270 Hz ( corresponding to a period of \sim 3.70 ms ) .