Authorities west of Atlanta are trying to figure out what caused a spectacular boom that rattled windows and prompted 911 calls. Residents of Carroll, Douglas and Haralson counties heard the boom around 9:45 p.m. Friday. Authorities say that no one who called 911 reported any emergency or explosion and no utility companies reported trouble. One theory that surfaced Saturday was that it might have been a sonic boom — a large shock wave created by an airplane that goes faster than the speed of sound — seems unlikely.
Full article: http://chronicle.augusta.com/latest-news/2010-11-27/mystery-boom-heard-west-atlanta?v=1290880343
