I have seen on a few occasions spontaneous, almost instant, flashes of pinpoint light. I did capture one on an image once - I happened to be imaging that part of the sky and saw the flash. Sure enough, it was on one (only) of the frames. It was probably around magnitude 1-2.
I suspect it was sunlight reflection off either a satellite or a weather balloon or some other high altitude object.
If I hadn't seen it visually, I probably wouldn't have noticed it in the sub.
Regards,
Tony.
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