Reports Report 3638bo (Event 3638-2021)

This report has been linked to the following event: Event 3638-2021
Observer
NameTarah M
Experience Level1/5
Remarks5 of us saw this while camping and it was truly incredible. I can't find anything explaining what it was or what happened. Please, if someone can let me know if you know what it was that would be amazing and relieving!
Location
AddressGrandjean, ID
Latitude44° 9' 54.98'' N (44.17°)
Longitude 115° 16' 12.5'' W (-115.27°)
Elevation1450.94m
Time and Duration
Local Date & Time2021-07-03 23:30 MDT
UT Date & Time2021-07-04 05:30 UT
Duration≈3.5s
Direction
Moving directionFrom up left to down right
Descent Angle121°
Moving
Facing azimuth177.08°
First azimuth138.37°
First elevation55°
Last azimuth195.63°
Last elevation35°
Brightness and color
Stellar Magnitude-28
ColorLight Green, Orange, Yellow, Red, White
Concurrent Sound
ObservationNo
Remarks-
Delayed Sound
ObservationYes
RemarksLoud resounding boom 3-5 minutes after sighting
Persistent train
ObservationNo
Duration-
Length-
Remarks-
Terminal flash
ObservationYes
RemarksHalfway through sighting there was a extremely bright white flash that lit up everything in the pitch black night.
Fragmentation
ObservationUnknown
Remarks-