In the NPR News item and podcast Former Astronaut On Watching For Life-Destroying Objects From Space Reporter Lulu Garcia-Navarro interviews physicist and former NASA astronaut Ed Lu, currently the executive director of the B612 Foundation:
GARCIA-NAVARRO: So we only just learned of this meteor because NASA only just now put up the information on its website. That's pretty worrying, I must say.
LU: Well, actually, the incident was observed right away.
LU: It's just that it was observed not by NASA but originally by a network of sensors used to detect atomic bomb explosions or nuclear-weapons tests around the world.
GARCIA-NAVARRO: Typically, how much notice do space agencies or observatories get about meteor or asteroid strikes?
LU: The typical notice for asteroid impacts on Earth is zero.
LU: And that's because the vast majority of asteroids are still untracked. This particular asteroid was quite small. It was only about 30 feet across. And the vast, vast majority of asteroids that small are not tracked.
Scott Manley just addressed this in his new video 173 Kiloton Explosion Over Bering Sea Was Asteroid Breaking Up a bit after
But there are sensors all over the world looking for these big blasts because they look a lot like nuclear blasts; they have the same kind of energy, and there are many people who want to know if someone is testing nuclear weapons, so these things get picked up by that same network.
But the nature of this network means that we don’t really get the results from it very quickly.
So while this answer suggests it's a comparison to a rocket launch that's appropriate, Manley suggests that it's the comparison to a nuclear test of kilotons that's relevant, and that matches better the graphic in the question showing Energy in units of kiloton yield.