If Strange Quark Matter (SQM) is the true ground state of hadronic matter, then conversion of Neutron Stars (NS) into Quark Stars (QS) could release some 10rilierg. We describe a scenario of burning of a NS into a hot, differentially rotating QS. Emission of released non-baryonic energy through the QS surface is discussed. The role of magnetobuoyancy of SQM is mentioned. The outflow of γe+e- lasting for up to ～ 1000 s could be at the origin of long GRBs, Advantages of hot, differentially rotating QS as an inner engine of long GRBs are reviewed.
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