In-depth Study of the Nearest Collapsars

Details In-depth Study of the Nearest Collapsars In-depth Study of the Nearest Collapsars

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1473k&link_type=abstract

Chandra Proposal ID #05500886

Physics

Chandra Proposal Id #05500886

Scientific paper

Since gamma-ray bursts are highly beamed phenomena (~1/500 of the sky on average), the closest such events will be beamed away from us and thus not be detected at high energies. These events are thought to constitute a few percent of the population of type Ib/c supernovae. Our ongoing type Ib/c radio survey is capable of revealing the signature of and energy released in the relativistic ejecta. However, the radio diagnostics are insensitive to the Lorentz factor of the ejecta -- perhaps the fundamental parameter which distinguishes GRBs from ordinary SNe. We show that the X-ray flux and spectrum, when combined with the radio data yields this crucial parameter. Here we propose the necessary combination of observations that will allow us to investigate the nearest collapsars.

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