Specimen found before February 19, 2013. The most spectacular fireball in over a century. Not much to add to what's already been written and recorded through video:

• Chelyabinsk Mega-meteor: Status Report
  -- Sky & Telescope
• Fire, Ice and Meteorites: The Search for Remains of the Chelyabinsk Superbolide -- by Dr. Svend Buhl
  
• "Roswell man owns real 'down to earth' collection"
  -- 11 Alive, WXIA-TV Atlanta
• "Meteor fragments could fetch thousands apiece"
  -- NBC Nightly News
• Flash and Shock wave at the University of Chelyabinsk
  -- (2:55 shows force of the shockwave)
• Bolide Explosion from dash & security cameras
• Spectacular dash cam video of fireball and smoke trail
• All You Need About Chelyabinsk's Surprise Space Rock
  -- Science@NASA Video
• Amazing audio capture of the shockwave in Chelyabinsk
• Video with time stamp detailing 2 minute 23 second delay from meteor detonation to shock wave impact
• Russian photographer Marat Akhmetaleyev captured a sensational collection of Chelyabinsk meteor photos
• Chelyabinsk strewnfield map by Dr. Svend Buhl
• Chelyabinsk Meteor, from Wikipedia
• A dangerous game of "cosmic roulette"?
  -- Anderson Cooper, 60 Minutes
• What We Now Know About The Chelyabinsk Meteor
  -- Shaunacy Ferro, Popular Science