Have you fired? Enemy arty can track your tracer.
When I play arty, the first thing I do is aim at the start point of the opposition, placing my reticule where I think the enemy arty will move to. I look out for trees, fences, etc getting knocked down and their tracers. Most of my arty kills are achieved this way
No couple of times I had not fired, and I also usually do not stay in the spots where the enemy might see arty to reduce chance kills.
Thing is I never get to see who shot me. So if it were an arty lucky shot I would see them after getting killed.