This was such a quick event that I do not know what to say about it and have described it as best as I could from your questions.
Location
Address
Exton, PA
Latitude
40° 0' 30.79'' N (40.008552°)
Longitude
75° 36' 55.59'' W (-75.615442°)
Elevation
-
Time and Duration
Local Date & Time
2012-04-12 20:00 EDT
UT Date & Time
2012-04-13 00:00 UT
Duration
≈1.5s
Direction
Moving direction
From right to left
Descent Angle
270°
Moving
Facing azimuth
164.05452°
First azimuth
163.61039°
First elevation
50°
Last azimuth
170.83762°
Last elevation
50°
Brightness and color
Stellar Magnitude
1
Color
bright green with a white
Concurrent Sound
Observation
No
Remarks
-
Delayed Sound
Observation
No
Remarks
-
Persistent train
Observation
Unknown
Duration
1s
Length
5°
Remarks
It was so brief and I was so unsure of what I just saw it is hard to recall details. I saw a green streak with some white at the end and then it was gone.
Terminal flash
Observation
No
Remarks
I can only say that as I was stopped at the light I suddenly saw this quick green streak in the sky. It happened so quickly that I questioned if I did see it. I kept looking but did not see anything else. I wondered about it but shrugged it off. It was only when I saw the notice on the internet this morning that I realized it must have been related.
