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A model for Gamma ray bursts inner engine based on quark stars (speculated toexist in nature) is presented. We describe how and why these objects mightconstitute new candidates for GRB inner engines. At the heart of the model isthe onset of exotic phases of quark matter at the surface of such stars, inparticular the 2-flavor color superconductivity. A novel feature of such aphase is the generation of particles which are unstable to photon decayproviding a natural mechanism for a fireball generation; an approach which isfundamentally different from models where the fireball is generated duringcollapse or conversion of neutron star to quark star processes. The model iscapable of reproducing crucial features of Gamma ray bursts, such as theepisodic activity of the engine (multiple and random shell emission) and thetwo distinct categories of the bursts (two regimes are isolated in the modelwith \sim 2 s and \sim 81 s burst total duration).Comment: 8 pages, 3 figures, new and more appropriate title. Major changes in  the text (aspects of the models discussed in more details), better quality  Figure 1 and Figure 2 and added Figure 3, version to appear in  Astronomy&Astrophysic

Quark stars as inner engines for Gamma ray bursts?