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A meteoroid fell to Earth on February 15, streaking some 20 to 30 kilometers above the city of Chelyabinsk, Russia at 9:20am local time. Initially traveling at about 20 kilometers per second, its explosive deceleration after impact with the lower atmosphere created a flash brighter than the Sun.

from the Guardian

Scientists reveal the full power of the Chelyabinsk meteor explosion

from Slate Magazine

Astronomers May Have Traced the Huge Chelyabinsk Meteor Back to an Asteroid

from NASA

Around the World in Four Days: NASA Tracks Chelyabinsk Meteor Plume