I won't be posting the list of systems, however you can get it yourself. Search the NASA radio catalogue with the string sequence: PSR J0006+1834 to PSR J2354+6155 within 57 kiloparsecs. Export the list and cross reference the names in-game (not all pulsars are included in Elite). There are a few pulsars that have proper names in Elite, so include those as well (I suggest EDDiscovery to make it easier). Run it through Spansh to create an efficient route and off you go.
Yes, neutrons are a strong candidates for sirens.
If the reference to a "siren" does point to a pulsar or neutron star then there's a problem with the Bootes Void. It doesn't seem to have either one - no reference I can find online on this void mentions any.