I agree with investing that money somehow until the 6 months after graduation, when your first bill comes and then pay it off. It's the only loans ever with a delayed interest gain, so you might as well take advantage of it.
I also agree that CD rates are really low right now. In fact, I know my just regular savings account for my capital one 360 account gets better rates than any CD rates I've seen offered through mint.com, capital one 360, or my local credit union. So I'd say to just hang on to that money in the highest savings rate you can find. It won't be much more, but it will be more than if you paid it off right now, and it'll be guaranteed. (Here's my refer a friend link to capital one 360:
https://r.capitalone360.com/fvMaBF6sbX The savings rate is .75% on the savings account. One of the best rates around right now. Also, you should get $20, and I should get $20 if you sign up with like $250. Also, please don't feel like I am in any way pushing you to use my link. In fact, if you look on the MMM blog, you'll probably find an even better sign up deal. Either way, use a sign up deal, because 'hey, free money!')
Or you could invest it, but it'll be nice to pay them off right away, which might not happen, if the market tanks right at that 6 month mark. It'd be no problem if you were investing for retirement, but more of a problem since you have a very short time-frame.
Good luck, and congrats on being able to pay off your loans right away!