At family holiday home in ( very remote) County Donegal,Ireland. I awoke unusually early (6:30am) and instantly alert. Decided to video and photograph the sunrise, something I have never done? Took several pictures and videos before and after object appeared in photo, with no resulting foreign/unexplained objects. Nothing appeared in the sky at any time. My instant reaction was that perhaps my iPhone camera was broken? However couldn't understand how pics immediately before and after photo in question, didn't have a huge black triangle (apparently hovering in sky?)Was in shock for the rest of the day.