They're flashing us?
I hope you know my position on aliens ( very likely to exist...but much too far to talk with or visit)...
But this is a credit to our detection system...and perhaps - a final blast or flash of light from a dying civilization?
"In 2019, astronomers reported about 20,000 newly discovered transient objects at visible wavelengths, about 100 times greater than a decade prior."
Good read!