(Click to enlarge)
I took this on 12/13 at 1:25am. It's a long exposure, so it's brighter than the clear, dark sky I saw (although it's best-viewed in a dark room).
It lasted about 5 minutes and then it was gone. It was confined to an area between Hackensack Ave (where the traffic lights are) and some point behind the church and Rt 4. It was no higher than the trees.