Distant craft in the same part of the sky for 3 nights, seen by a group

This event occurred over several nights.  I was a university student, living in a dormitory.
 On the first night, I saw a distant craft.  The reason I knew it was a craft and not a star was that it did not move at all - and then at a certain point - it took off and disappeared quickly.
 The same thing occurred on the second night.  This time I had one or two friends with me.
 On the third night, I gathered a group of the other members in my dorm (perhaps 8-15 others), and we all watched it do the same exact thing.
 On the fourth night, I called the observatory on campus - and the craft did not appear.  I felt that the beings in the craft knew I had called the observatory, and that's why it didn't appear.
 All along, as I (and then we) looked at the craft, I felt the craft members knew we were watching them, and were in fact looking back at us.
Date is approximate.  PD