A kernel panic is something that you'll want apple to take a look at since the machine is under warranty I'm guessing.  It's usually hardware related.  Often, it's caused by bad ram but can also be caused by a bad part in the computer itself such as dying hard drive, cracked logic board, bad usb port etc...  I don't mean to alarm you.  But the kernel panic creates a log of what happened and a good Genius at the bar should be able to diagnose what happened.