Hello ts20.no, great to hear from you again, and with such exciting news too!
I was following this interesting event and just this morning, before the garden work took me off my pc, I was sorting through the BOOMs and RSBOOMs that our network has in Norway. The trace that you have recorded is indeed impressive, to say the least!
Such a fireball would definitely have produced intense sonic booms during its atmospheric reentry phase and quite the lighting, as your camera has observed.
Regarding your trace, from AM.R25D6, which I took the liberty of plotting here below,
it was recorded as you said at 23:11:29, so 157 seconds after the timestamp of the bright light on the video you attached.
Since sound travels way slower than light, especially through the air, if we assume that the air displacement (sound) wave was travelling at the standard speed of sound of 343 m/s, it means that the originating point of the soundwave was 50.42 km from your location, which, considering the fact that the trajectory of sound is inside a three-dimensional volume, is perfectly in line with your 40 km away estimation. If we then use these two measurements to calculate the height of the explosion, we obtain a value of 30.69 km, which again, is in line with most documented meteor re-entry data, just a bit on the lower part of the average.
So, again, congratulations on recording this very fascinating event and thank you for having shared your experience with us!