1. Observatoire de la Côte d'Azur Nice France
2. Instituto de Física, Universidade Federal do Rio Grande do Sul (UFRGS) Porto Alegre Brazil
3. International Center for Relativistic Astrophysics Network (ICRANet) Pescara Italy
4. Universidad Nacional Autónoma de Mexico (UNAM) México City Mexico
5. Frankfurt Institute for Advanced Studies (FIAS) Hessen Germany
6. Universidade Federal de Santa Maria (UFSM) Santa Maria Brazil