Failure to award Free Throws - Correctable When?

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Partner and I had a great boys game tonight. Came down to two chances to tie with 3 pointers with 5 seconds left but both rimmed out. At halftime we were talking and both of us have had a game in last week with the same partner who failed to award merited free throws. We were talking about awarding the shots. I got an absolute total case of brain freeze. I promise I don't drink and I did remember to take the little pills to stop the voices. But I cannot remember if you can award missed merited free throws at any time in game when the error is discovered or not! I thought I read that you could the other night but couldn't find it at halftime. I'm tired tonight. Someone just give me the answer, please. I hate not being able to remember this!