Reports Report 2070fc (Event 2070-2019)

Observer
Name Kathlean W
Experience Level 3/5
Remarks I 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
Address Madison, WI
Latitude 43° 7' 33.44'' N (43.125956°)
Longitude 89° 22' 2.75'' W (-89.367431°)
Elevation 260.920807m
Time and Duration
Local Date & Time 2019-05-10 23:45 CDT
UT Date & Time 2019-05-11 04:45 UT
Duration ≈3.5s
Direction
Moving direction From up left to down right
Descent Angle 106°
Moving
Facing azimuth 97.39°
First azimuth 109.12°
First elevation 32°
Last azimuth 120.9°
Last elevation 28°
Brightness and color
Stellar Magnitude -13
Color Light Blue, another person who saw it from another location saw it as green
Concurrent Sound
Observation Unknown
Remarks -
Delayed Sound
Observation Yes
Remarks Low 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
Observation No
Duration -
Length -
Remarks -
Terminal flash
Observation No
Remarks -
Fragmentation
Observation No
Remarks -