Cecil, Rahul Joseph [P:(DE-H253)PIP1097682] ; Barbosa Martins, Victor [P:(DE-H253)PIP1085491] ; Lypova, Iryna [P:(DE-HGF)0] ; Meyer, Manuel [P:(DE-HGF)0] ; Wagner, Stefan [P:(DE-HGF)0] ; H. E. S. S. Collaboration [P:(DE-HGF)0]