Madame L thanks you, Laura, for posting this comment:
"From what I read, this one was only two meters wide. Is it possible that one that small just doesn't make it on the radar (so to speak) of astronomers? Also, people were only injured, mostly from shattering glass as they got close to windows to see what was causing the noise, than from the meteorite itself. I read another interesting blip about why so much of it was captured on dashboard cams - it's because Russians are apparently horrible drivers so many people have dashboard cams as liability protection. But I'm rambling now, and this is your blog, Esteemed Madame Elle, not mine."
In fact, Madame L read the same thing: No one was killed, but people were injured by flying glass and so on, when the meteorite hit in Russia. And, as you wrote, the one that struck Earth was not an asteroid and was small enough to invisible to the astronomers who are tracking these things.
Check out these great NASA graphics showing the space junk in low-earth orbit (LEO) to get an idea of the needle-in-a-haystack nature of the project of identifying all these objects. (Here's one of them, below:)