I get an answer for a question with a bounty:    

http://mathoverflow.net/q/232039/34538     

The problem is that the answer came 2 hours before the beginning of the grace period.  
The answer *seems* interesting and the author serious, but I will not have not enough time to check if it is really satisfying before the end of the grace period.

What should I do?  
Should I award the answer just by the belief it is satisfying (but without being sure, yet)?