We're in Kennesaw, Cobb near Cherokee County. I chose my screen name just because I liked it, and usually I'm the one who's looking up at the sky and the man in the moon. My husband thinks it might have been space junk, but whatever it was, it was the brightest biggest thing - besides the space shuttle which I was fortunate enough to see fly overhead one night in Miami. I googled "meteor over Georgia", and this was the only site I found that mentioned this event.
My husband and I also saw it. We were out walking the dog, and I noticed a bright light, almost like a searchlight, shining down and casting shadows of the trees on our driveway. My husband, lucky for him, was looking looking up and saw what you described!