Gal-Yam2006 GRB060614的观测 3

主要内容:
GRB060614是一个很近的长暴, z=0.125. 但是没有超新星成分, 作者认为这说明需要新的伽玛暴的爆发机制.

精彩摘抄:

光变, 没有超新星成份.

文章信息:
astro-ph/0608257
The gamma-ray burst GRB060614 requires a novel explosive process
Authors: A. Gal-Yam (CIT) et al

Over the past decade our physical understanding of gamma-ray bursts (GRBs) has progressed rapidly thanks to the discovery and observation of their long-lived afterglow emission. Long-duration (T <> 2 s) GRBs arise from a different origin, which has been argued to be the merger of two compact objects, either neutron stars or black holes. Here we present observations of GRB060614, a 100-s long burst discovered by the Swift satellite, which require the invocation of a new explosive process: either a massive ``collapsar'' that powers a GRB without any associated supernova, or a new type of engine, as long-lived as the collapsar but without any such massive stellar host. We also discuss the properties of this burst's redshift z=0.125 host galaxy, which distinguish it from other long-duration GRBs and suggest that an entirely new type of GRB progenitor may be required.

Vol 444，1053|21/28 December 2006| doi:10.1038/nature05373