This Clear UFO vanished after 15min.... Jan, 2014

Date of Sighting: 15-Sept-2013
Place of Sighting: CO, US
Description of Sighting Report: " My sons and I just arrived from my youngest base ball game, when we were getting out of the truck we all seen it and the boys were asking me what is that and I said I don't knows. I then sent my oldest son to go get the camera I tried to snap a couple pictures but I don't have the steadiest of hands so I gave the camera back to my oldest,son and he snapped a few photos and of all the photos we got one good one. We watched it for about 15 min then it just vanished we didn't see it shoot off in any direction I it just vanished."