The recent discovery of sub-second, bright, optical flashes in the night sky has generated questions about their origin. Are they all just a class of previously unknown glints from space debris? Or are some of the flashes of astrophysical origin? We discuss a stereoscopic ranging system, currently under construction, designed to detect bright flashes during a two-year observational survey and discriminate, on a flash-by-flash basis, foreground space debris glints from astrophysical flashes. The survey will enable a search for sub-second astrophysical flashes with an estimated sensitivity that is at least an order of magnitude better than existing limits.
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