Throw Trap 4 (Source)
From SWGANH Wiki
When I played earlier today, it seemed to work like pre cu trapping xp...i.e. you throw the trap and get XP based on whether the trap hits or not, and you don't have to wait for the creature to die before you get xp. I don't know how levels and such work (I'm lvl 80, fighting 79-82's), but I believe it is based on your trapping ability vs. the creatures lvl.
Yup, that's the short answer and it's substantially accurate.
your TL v CL of target for trapping XP
Trap XP awarded per successful 'stick