Highly unlikely...
...that the scrambled Mirage was in the vicinity of the aircraft when it went down. Don't know the time line of the ATC request for the aircraft to squawk 7700, but since the Cold War I don't believe we've had a/c at immediate launch ready. So by the time the Mirage launched, the a/c was almost certainly down. I believe I read something on this string about locals reporting Mirages flying around, but after the crash.