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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.

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from the Guardian

Scientists reveal the full power of the Chelyabinsk meteor explosion

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from Slate Magazine

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

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from NASA

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