On 25.09.2013 I was in the countryside near Sofia. So I was just playing with my phone taking pictures. I've decided to take image of blue sky with airplane passing over. At this moment nothing curious happened until few days after I began checking what I've made. I've made a sequence of 3 photos.First one is taken at 10:05:27 and there is nothing interesting (20130925_100527.jpg), second one at 10:05:29 which is only 2 seconds from the first one when the object is visible in front of the airplane (20130925_100529.jpg) and third one is at 10:05:40 where is also nothing interesting (20130925_100540.jpg).The coordinates are Latitude = 42º57'56.1016"Longitude = 23º24'42.6736"