two extremely bright pulses of white light followed by brief sound of a loud charge like you use to hear in the old frankenstein movies. No transformer problems, no surge in my computer that I was on, no electrical surge in the house no fire sirens in our small town going off. Our dog wanted immediately out so we let him out in the yard and and he stopped dead in the center of our yard and looked straight up into the sky for several minutes with his head turning as if to follow something. It was a cloudy cold day so nothing was visible except the intense flash of light that was piercing.