UFO Sighting in Englewood, Colorado on June 5th 2015 – a single round green light hovered in a lightning storm for 4 minutes then descended slowly

I was sitting on my balcony, watching a thunderstorm at about 8:55 pm on june 5th 2015 when i noticed a green lighted oblect in the sky after the lightning had gone. I thought it was a plane however it did not move at all. It stayed perfectly still for about 4 minuted before descending slowly straight down below the treetops. After i lost sight of it. I felt very excited and confused.