Re: Fireball Detection . . .
No, it certainly doesn't sound like a Tunguska-class event -- the (visible) energy released is only in the kiloton range. However, based on the news stories, it sounds like a strong shock was felt in the ground, which would seem to indicate that something really did impact. My suspicion is that this was a nickle-iron meteorite that remained intact all the way to the ground, and didn't produce an airburst. Probably left a decent-but-smallish crater with some nice chunks of metal embedded underneath. Still worth checking out.
Cheers,
Nathan