It is actually 25% that goes to curators, used to be 50% some time ago though, but it is given as Steem Power, that's correct.

Here's a quotation from a post:

• 1 to 3 minutes - you get 100 % of the curator's share as author
• 3 to 15 minutes - you get 90 % of the curator's share as author
• 15-27 minutes - you get 50% of the curator's share as author
• 27-30 minutes - you get 10% of the curator's share as author
• After 30 minutes the 25% go completely to the curators and you as author don't get a share of it anymore.

So if voted in the first 30 minutes, some of the curator's share goes back to the author depending how soon the post is being voted.