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\footnote{\citet{Duncan_1992} also briefly mentioned this scenario as a possible explanation for cosmological GRBs.}  The newly formed neutron star then loses its rotational energy quickly due to electromagnetic torque, generating electric fields that accelerate particles to ultra-relativistic energies, which eventually give out $\gamma$-ray. The energy released time scale due to magnetic dipole luminosity and gravitational wave emission of $\sim 20 \ \rm s$ for a typical magnetar is consistent with the timescale of long-duration GRBs \cite{Usov_1992}. Near the magnetar's surface out to the light cylinder, the optical depth to this radiation due to Compton scattering, absorption, and pair-cration is large. The radiation has to propagate out to a photosphere radius of $\sim 10^8 \ \rm cm$ before it is released. The typical radiated $\gamma$-ray energies of $0.1-1 \ \rm MeV$ is also consistent with those observed from GRBs \cite{Usov_1992}.  \   Recent works have shown that while magnetars formed via AIC might be responsible for some GRBs, magnetars formed in the core collapse of massive stars like the one proposed by \citet{Duncan_1992}.