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The gamma-ray burst (GRB) 060218 has ~ 10^5 times lower luminosity thantypical long GRBs, and is associated with a supernova (SN). The radio afterglowdisplays no jet break, so that this burst might arise from amildly-relativistic spherical outflow produced by the SN shock sweeping thestellar surface. Since this model is energetically difficult, we propose thatthe radio afterglow is produced by a non-relativistic phase of an initiallycollimated outflow (jet). Our jet model is supported by the detection ofoptical linear polarization in the SN component. We also show analytically thatthe jet can penetrate a progenitor star. We analyzed the observational data ofthe prompt emission of this burst and obtained a smooth power-law light curvewhich might last longer than 10^6s. This behavior contrasts with the longintermittent activities with the X-ray flares of typical GRBs, implying thatthe central engine of this burst is different from those of typical GRBs. Thisargument is consistent with the analysis of the SN component of this burst,which suggests that the progenitor star was less massive and collapsed to aneutron star instead of a black hole. The collimation-corrected event rate ofsuch low-luminosity GRBs is estimated to be ~ 10 times higher than that oftypical long GRBs, and they might form a different GRB population:low-luminosity GRBs are produced by mildly-relativistic jets from neutron starsat the collapses of massive stars, while typical long GRBs byhighly-relativistic jets from black holes. We suggest that the central engineof GRB 060218 is a pulsar (or a magnetar) with the initial rotation period P_0\~ 10ms and the magnetic field B ~ 10^16G. A giant flare from the magnetarmight be observed in future.Comment: 14 pages, 3 figures, 2 tables added, references added. Accepted for  publication in ApJ. Replaced with the accepted versio

Low‐Luminosity GRB 060218: A Collapsar Jet from a Neutron Star, Leaving a Magnetar as a Remnant?