GRB051022--Localization of a Candidate High Redshift Gamma-ray Burst

Details GRB051022--Localization of a Candidate High Redshift Gamma-ray Burst GRB051022--Localization of a Candidate High Redshift Gamma-ray Burst

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.2006r&link_type=abstract

Chandra Proposal ID #06508231, p.1

Computer Science

Chandra Proposal Id #06508231

Scientific paper

Based on the observed characteristics of GRB050904, at z=6.29, it is anticipated that high redshift (z>6) GRBs will be characterized by long durations, of order ~30s*(z+1). Also, GRB050904 was very bright: S ~ 5 x 10^-6 ergs cm-2. A GRB with several characteristics in common with GRB050904 has been discovered and localized by HETE to ~2 arcmin accuracy (GCN4131). The HETE source, GRB051022, has flux comparable to GRB050904, and is exceedingly long (~300 s), consistent with z>6. No prompt optical counterpart was detectable at a limit of R>20 (GCN4134). A followup observation by the Swift XRT established an X-ray afterglow (XAG) and refined the HETE localization to ~10 arcsec. In order to obtain an <1 arcsec localization of GRB051022, we propose ACIS-S observations of the X-ray afterglow. Only Chandra can provide such an accurate XAG position. Furthermore, the history of GRB research has repeatedly shown that <1" localizations are essential to confidently identify a host galaxy.

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