There was a report on NASA website sometime ago, which I believe may have changed now so yes I am wrong. The report though was a flash of light but left no scar. It was said to be the explosion as a result of the initial impact. The main explanation was jupiters intense gravity took a long time for the flash to appear from the centre where the asteroid/comet finally exploded. I cant find the article so I can only be wrong. Sorry.
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