A survey of dark gamma-ray burst hosts

Details A survey of dark gamma-ray burst hosts A survey of dark gamma-ray burst hosts

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cxo..prop.2919l&link_type=abstract

Chandra proposal ID #11900125

Physics

Scientific paper

A fraction of gamma-ray bursts (GRBs) are dark in the optical, often suggesting suppression relative to the X-ray flux. These bursts may originate in highly obscured environments, different from those of the optically bright GRBs. We propose to continue our earlier program by conducting a set of modest ToO observations of these GRBs. Chandra observations will provide precise burst positions (~0.5") and, unlike Swift-XRT observations will enable the unambiguous location of the host galaxy. Subsequent HST imaging will provide broadband magnitudes, colours and morphologies. Our early results suggest that dark bursts hosts can be markedly different from those of the bright population, and motivates the need to gather a larger sample to accurately constrain their properties.

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