"According to Brown, 2014 AA triggered very weak detections at three infrasound stations. His triangulation from those records, shown in the graphic at right [see link], indicates that the space rock slammed into the atmosphere near 40° west, 12° north. That location, about 1,900 miles (3,000 km) east of Caracas, Venezuela, is far from any landmass. " http://www.skyandtelescope.com/commu...238481431.html
This thing was too small to be detected much earlier than it was. It was just a large meteor actually. Dangerous objects are all picked up in good time to warn of impact by the NEO surveys. If you want to keep track of what's happening out there check on the NEOCP site at the Minor Planet Center http://www.minorplanetcenter.org/iau/NEO/ToConfirm.html. You will find the official circular reporting on 2014 AA (MPEC 2014-A2)