If a possible bounty is currently in a public thread, then you are able to join into that thread to make an attempt on capturing them. If you wish to not face a disturbance from other possible PCs, then you can contact the bounty via the messenger and ask them to do a thread with you that involves you chasing after them. However, in both cases you do have to get confirmation from the player OOC wise that they are okay with you capturing them for their reward. If the condition for the bounty is listed as "dead," it is VERY unlikely the player will actually allow you to kill their character to bring them in for obvious purposes.
Hope this helped clear it out a little.
[member="Jaresh Karv"]