The shortest possible game is the Fool's Mate, which would surely never happen at the GM level. What is the shortest known GM level game that ended in checkmate?

Edit There seems to have been some misunderstanding due to the tone of the question. By shortest game, I do not mean it has to be less than 10 moves or so. The right answer could be 58 moves as well. This is obviously not of any major consequence, except as a potential quiz question. I did try looking around on a few sites, but did not get the right answer.