Brief flash of bright light in southern sky 60 degrees above the horizon.A bright flash of white light (like a camera flash) lasting approximately 1/2 second.In the southern sky approximately 30 degress to the west of the Southern Cross constellation and approximately 60 degrees above the horizon. The sky was clear and no sound heard, in particular no aircraft. The sighting was in a country region 20 kms. from the town of Pemberton in the south west of Western Australia.