Half conformally flat gradient Ricci almost solitons
  The local structure of half conformally flat gradient Ricci almost solitons is investigated, showing that they are locally conformally flat in a neighborhood of any point where the gradient of the potential function is non-null. In opposition, if the gradient of the potential function is null, then the soliton is a steady traceless $\kappa$-Einstein soliton and is realized on the cotangent bundle of an affine surface. 
M. Brozos-V\'azquez, E. Garc\'ia-R\'io, X. Valle-Regueiro
math.DG