Panic Reports are stored at:
/Library/Logs/DiagnosticReports
If you copy and paste that string into:
Finder > Go menu > Go to Folder
it will take you to where those reports are stored.
They are named with Date&Time and end in .panic
You can post the entire report here, by using the “additional text” Icon in the reply header (looks like a paper with writing).
Please don’t post more about 20 lines of any other types of reports — they are interminable, and any information useful for this purpose is on the first screenful.
There are three quick take-aways from any panic report.
1) The panic-reason,
2) the extensions present at the "scene of the crime", and
3) the BSD process in which the problem occurred.
One more item that is important is the names of any third-party Extensions you have added. They are shown FIRST in the extensions loaded section