Meteorite hit Russia, injuring almost 1,000

On 15 Feb, a meteorite entered Earth and came direct impact onto central Russia, setting off a shockwave that shattered windows and injuring almost 1,000 people in an event unprecedented in modern times. Preliminary investigation by the NASA suggests the meteor is unrelated to the less than 24 hours later asteroid which was set to pass Earth at a distance of 27,520 kilometres.

Quote from Nasa,

The trajectory of the Russia meteor was significantly different than the trajectory of the asteroid 2012 DA14, which hours later made its flyby of Earth, making it a completely unrelated object.

The reason as to why the Russian meteor was not detected is because it came out of the daytime sky. These are nearly impossible to find ahead of time because telescopes can only spot asteroids during the night. This is as quoted from the NASA.