I've provided an answer on a question with a bounty, however once my answer was accepted I was not credited the bounty. The question in question is:
As you can see in the question's revision history:
Bounty Ended with no winning answer by Community♦ (Sept. 16th)
So the bounty was not awarded by the person who started it. Accepting an answer doesn't award the bounty.
If I understand the question's timeline correctly, you answered on Sep. 8th and got an upvote on Sep. 12th. You got a second upvote on Sep 19th, i.e. after the bounty period was over.
According to the bounty FAQ, for an automatic bounty award, you would have needed two upvotes before the 16th to get (half) the bounty amount.
It's worth noting that the rules of the bounty system have changed since this question was originally asked. Under the current rules, the answer would be awarded the bounty if it was accepted.
If the bounty was started by the question owner, and the question owner accepts an answer during the bounty period, and the bounty expires without an explicit award – we assume the bounty owner liked the answer they accepted and award it the full bounty amount at the time of bounty expiration.