Without a telescope, the satellite theory is probably best. Stars do flicker and I’ve seen ones that appear to flash due to atmospheric effects. Your question is one which tickles my desire to have a decent telescope someday.
I hope this helps. I’m curious if one of these in the eastern sky was your flasher. Adjust the time slider for your observation window. Based upon azimuth and elevation, you may find one which fits.
https://in-the-sky.org/satmap_worldmap.php
And try this. Unfortunately I believe it selects your night sky based upon IP location, so I cannot see Libra; perhaps you can.
https://www.heavens-above.com/skyview/?lat=0&lng=0&cul=en#/livesky
Awesome links. Saving for tonight. Thanks!