Bright white flash circular/ball like figure appears and disappears.

I was on a 30 min break outside, it was 30 degrees with a light breeze, approximately 0137AM-0141AM. As I was sitting outside of my building (Anthem STL) steps (facing toward the Union Station Hotel above the left side of the building in sky @ 130-150 degrees SE), I caught a very quick glance of a bright white flash it was a perfectly orb/spherical like figure that had appeared to be zipping downwards at what appeared to be curve and right as it was doing that it disappeared in the sky it was clear a night/morning no clouds were visible. Observer is a security supervisor who is 21 at the time of the sighting who works overnights (2200PM-0600AM).