Answer: Heat, dot of light flashing by, explosion
Explanation: In an article published by the New York times and written by Ellen Barry and Andrew E. Kramer on February 15th, 2013, titled, "Shock Wave of Fireball Meteor Rattles Siberia, Injuring 1,200."
A blogger named Darya Frenn that experienced the event was quoted to have written “I opened the window from surprise — there was such heat coming in, as if it were summer in the yard, and then I watched as the flash flew by and turned into a dot somewhere over the forest, And in several seconds there was an explosion of such force that the window flew in along with its frame, the monitor fell, and everything that was on the desk.”
From the excerpt above, it can be deduced that the order in which he experienced the event was
1) Heat,
2)dot of light flashing by, 3)explosion.