Chandra Arcsecond Localization of the Dark Burst GRB020321

Details Chandra Arcsecond Localization of the Dark Burst GRB020321 Chandra Arcsecond Localization of the Dark Burst GRB020321

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop.1060f&link_type=abstract

Chandra Proposal ID #03508087

Computer Science

Chandra Proposal Id #03508087

Scientific paper

Roughly 1 in 3 arcminute-scale GRB error boxes fail to yield an optical transient despite intensive ground-based searches. These "dark bursts" must be subject to severe optical extinction, either within their host galaxy or because they are located at z>5. Well-localized dark bursts thus identify highly obscured star-forming galaxies or galaxies close to the epoch of reionization - objects of great interest in either case. We propose to localize the dark burst GRB020321 with a single 20-ks Chandra observation. Despite rapid notification and a small error box (GCNs 1284, 1285), prompt observations have failed to reveal an optical or radio afterglow of this burst (R<24; GCNs 1289, 1305). Given the 2'-radius localization we anticipate at most two interloping X-ray sources; comparison with optical datasets will thus allow a unique identification of the GRB afterglow. The expected X-ray flux will be extrapolated from BeppoSAX observations to further cement the source identification.

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