TY - CPAPER AU - D. Lazzati AU - Mitchell Begelman AU - G. Ghirlanda AU - G. Ghisellini AU - C. Firmani BT - unknown N1 - JILA Pub. 7546 PY - 2005 T2 - unknown TI - GRB jets inside and outside the star: precursors and cosmological implications UR - http://arxiv.org/pdf/astro-ph/0503630v1.pdf ER -