The gamma-ray burst (GRB) 060218 has ~ 108 times lower luminosity than typical long GRBs, and is associated with a supernova (SN). The radio afterglow displays no jet break, so that this burst might arise from a mildly-relativistic spherical outflow produced by the SN shock sweeping the stellar surface. Since this model is energetically difficult, we propose that the radio afterglow is produced by a non-relativistic phase of an initially collimated outflow (jet). Our jet model is supported by the detection of optical linear polarization in the SN component. We show analytically that the jet can penetrate a progenitor star. A possible engine of a neutron star is also discussed.
|出版ステータス||Published - 2006 12 1|
|イベント||16th Workshop on General Relativity and Gravitation in Japan, JGRG 2006 - Niigata, Japan|
継続期間: 2006 11 27 → 2006 12 1
|Conference||16th Workshop on General Relativity and Gravitation in Japan, JGRG 2006|
|Period||06/11/27 → 06/12/1|
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