You probably saw a bright satellite (ISS etc) - an iridium doesn't hold the same brightness - it rapidly brightens (the flare) then just as rapidly fades, over less than 10sec or so.
If you have astro software - check the alt/az info for your loc at that time, and that will give you a very good indication of where it will flare - ie, in between the moon and arcturus..... really helps, especially with the less bright flares.
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