Localization of `OPTICALLY-DARK' Gamma-Ray Bursts by Chandra and HST

Details Localization of `OPTICALLY-DARK' Gamma-Ray Bursts by Chandra and HST Localization of `OPTICALLY-DARK' Gamma-Ray Bursts by Chandra and HST

Sep 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000cxo..prop..625r&link_type=abstract

Chandra Proposal ID #02500821

Physics

Chandra Proposal Id #02500821

Scientific paper

We propose Chandra (CXO) observations of 4 GRBs detected by the HETE-2 soft X-ray camera, with contemporaneous observations with HST. These observations are "relaxed" TOOs, performed 7-16 days after burst detection. To optimize the chance of isolating Z > 5 GRBs, we will select "dark GRBs" for which no optical counterpart has been found by ground-based searches within 2 days of GRB onset. Previous CXO GRB searches have required that observations start within ~24 hours of burst onset, placing an enormous strain on CXO operations. We have determined that 30 ks observations made 7-16 days after burst onset will detect sufficient photons to allow <0.7" localization of the GRB afterglow. We will immediately place all CXO and HST positions and intensities in the public domain via the GCN.

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