Started as a very very bright white light pulsating in the sky.

It hovered for about 10-15 seconds from the point i saw it pulsating its white bright light in the night sky, the after going very bright just shot off and dissapeard.

it was a reasonably clear night, i could see aeroplanes in the sky, and could see there lights flashing clearly, this was not acting like the rest of the planes in the sky, at first upon opening my back door i thought it was just a star, but then when it started pulsating and hovering slowly i realised different, i tried to call my girlfriend to witness it, but she didnt get to the door in time before it extinguished its light and shot off.