I asked a question a while ago, the bounty on it expired and I sort of forgot about it. I now see that one answer has been awarded a bounty of +25 which I think I did not award. Anyhow, is there anyway to award a bounty now to an answer that was particularly helpful?
In your absence, half the bounty automatically went to the highest-voted answer. You lost all 50 rep points that you put up for the bounty, though; this always happens regardless.
You can't award the bounty now; you'd have to put a second bounty on it (and you can only award bounties to new answers -- i.e., answers that show up after you post the bounty). So you should probably just upvote and accept the answer you found helpful.