Very speed circular UFO caught since Red Rock Casino

On April 2017, a witness was at the famous Red Rock Casino, outside the city of Las Vegas, Nevada. Here, he has taken a photo where appeared circular UFO.

Witness report:

We stayed at the Red Rock Casino outside of Las Vegas on March 31st, April 1st and April 2nd 2017. On the morning of April 1st at approximately 7am I was getting ready to go golfing. Since I was up and ready to go before my family I looked out the window to admire the mountain views. I took three pictures with my cell phone. I did not see anything out of the ordinary. We were on the 16th floor of the hotel, facing the mountains. After returning home from our trip I checked out some of the pictures on my cell phone and noticed that one picture taken from my room had a odd image in the top left of it. I expanded the picture out and saw that it looked like a round disc that looked as if it was moving because of the image. See picture. I went to the store and had pictures made. The object was unbelivible. I had a larger blow up made and could not believe that this was on the picture. After showing several friends the picture all of them immediately said what is that a ufo. After getting the pictures I made a decision to contact you to report what was on the picture. The other two pictures did not show anything that I could see. On Friday night before this happened Las Vegas has a very big storm. I have submitted three pictures for review.