Pili, A. G.A. G.PiliBUCCIANTINI, NICCOLO'NICCOLO'BUCCIANTINIDrago, A.A.DragoPagliara, G.G.PagliaraDel Zanna, L.L.Del Zanna2020-05-072020-05-0720161745-3925http://hdl.handle.net/20.500.12386/24572We investigate the possible implications of quark deconfinement on the phenomenology of long gamma-ray bursts focusing, in particular, on the possibility to describe multiple prompt emission phases in the context of the proto-magnetar model. Starting from numerical models of rotating Hadron Stars and Quark Stars in full general relativity we track the electromagnetic spin-down evolution in both the hadronic and quark phase, linking the two families through conservation of baryon number and angular momentum. We give estimates of the time-scales and the energetics involved in the spin-down process deriving, in the relevant spin range, the relation between the initial and the final masses and rotational energies, whenever hadron-quark conversion is possible. We show how the results can be used in relevant astrophysical cases such as the double burst GRB 110709B.STAMPAenArticle10.1093/mnrasl/slw1152-s2.0-84988660380000383516700006http://arxiv.org/abs/1606.02075v1https://academic.oup.com/mnrasl/article/462/1/L26/25895562016MNRAS.462L..26PFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_11 Relativistic astrophysics