Possible Duplicate:
How does the bounty system work?
On this StackOverflow question: facebook: why I can't send email from app to user? my answer was accepted and awarded a bounty.
The bounty was 500. The question asker had 500 rep deducted.
I was awarded 275 rep for the bounty. Why?
Was it an auto-accept after bounty expiration? If so, why wasn't it for 250 instead of 500? I thought auto-accept bounties were half. It does say on the question that the author accepted my answer though.