Reports Report 2070fc (Event 2070-2019)

This report has been linked to the following event: Event 2070-2019
Observer
NameKathlean W
Experience Level3/5
RemarksI have seen two other fireballs in my life and that taught me a bit about what to document. I saw one falling over the Pacific from an airplane (wow!) and also observed the one that crossed Wisconsin and landed in Iowa, back in 2010. I've also spent a lot of time in the high mountains, so I've seen many meteor showers and "shooting stars," so I have a good basis for comparison. Observation was made with my head on my pillow, looking out my window. I got a protractor out to check the height-angle details, and I could direct someone with more precise instruments to the exact reference points. Another person saw this from Johnson Creek (I asked on Facebook if anyone could confirm) and his perception was that it was greenish.
Location
AddressMadison, WI
Latitude43° 7' 33.44'' N (43.13°)
Longitude 89° 22' 2.75'' W (-89.37°)
Elevation260.92m
Time and Duration
Local Date & Time2019-05-10 23:45 CDT
UT Date & Time2019-05-11 04:45 UT
Duration≈3.5s
Direction
Moving directionFrom up left to down right
Descent Angle106°
Moving
Facing azimuth97.39°
First azimuth109.12°
First elevation32°
Last azimuth120.9°
Last elevation28°
Brightness and color
Stellar Magnitude-13
ColorLight Blue, another person who saw it from another location saw it as green
Concurrent Sound
ObservationUnknown
Remarks-
Delayed Sound
ObservationYes
RemarksLow grumbling sound a few seconds after it disappeared from view, like distant rumbling thunder, or like an airplane at the end of take-off sounds. We do have an airport nearby, so the timing of departing flights would need to be compared to be certain that was not what I heard.
Persistent train
ObservationNo
Duration-
Length-
Remarks-
Terminal flash
ObservationNo
Remarks-
Fragmentation
ObservationNo
Remarks-