While out watching for a Iridium Flare by a satellite pass expected in the Northern sky when I saw a very bright flash not associated with the flare and much larger. The sky was very clear without any clouds making the direction of view unobscured. The size was distinctly larger than any usual star or satellite and did not appear to be similar to any aircraft. There was no visible indication before or after the bright light which would have indicated an aircraft. It lasted only a moment and did not move, just suddenly appeared then vanished. There were no aircraft in the immediate area which it occurred, though some in both a Western and Eastern direction as it typical. This occurred only approximately 1-2 days from a falling star observed in the North East direction from the same viewing location which I didn't think of at the time as being more than a lucky spotting of a falling star.