Flash over Big Horn, WY

The report, as filed

On February 21st 2018, my fiancé went outside at approximately 3:45 AM to let the dog out. He stayed outside for about 5 minutes, observing the night sky. He then spotted a flash of light and movement that was not a star or a satellite. He woke me up to come watch the object. It was bitter cold and clear weather. I watched the object flash and move, leaving a bit of tracer lights. I observed it moving vertically and horizontally. It would disappear and then reappear with a flash of a light. It was not an aircraft, not a star and not a satellite. My fiancé told me how far the object had moved during his observation. It transversed about a third to one half of the night sky from south to north parallel to the Big Horn Mountains.

Held as-reported from National UFO Reporting Center (record NUFORC #138896). Witness text is preserved verbatim, including its spelling; nothing is edited beyond formatting.