What Was That?

Anybody else hear that huge BOOM that rocked Decatur at 1:36 p.m. ? Edit: Got confirmation that it rattled Bridgeport and Paradise. Edit: Heck, it was heard in northern Tarrant County. Edit: If it was a sonic boom, it's the loudest one I've heard in 20 years. Edit: The bloodhounds at Fox 4 are on the case. Edit: Star-Telegram now has the answer.