Where did you get that information? Any idea what the time lag would be between the arrival of light and the arrival of debris? I’m wondering what our window is to set up defensive measures.
Depends on what percentage of the speed of light the particles travel, and if there are any dust clouds or other obstacles to particle travel between us and the “big beam gun.”
Also depends on if the rotation axis is pointing at us or not.
Most of the data I got from Wikisky.org. (A must see 3D mapping site.)
As to the debris, it will be a while before even the fastest of it reaches us. Picture a spherical dispersion pattern across 640LY of dust and stellar filled space.
There will be NO large pieces of “debris”. The “nebula” which forms from a supernova explosion consists of gas, not solid matter.