GRB050412: The Darkest of the Dark Bursts

Details GRB050412: The Darkest of the Dark Bursts GRB050412: The Darkest of the Dark Bursts

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004cxo..prop.1864b&link_type=abstract

Chandra Proposal ID #06508208

Physics

Chandra Proposal Id #06508208

Scientific paper

Swift localized GRB050412 to few-arcminute precision in real-time while it was in the night sky over most of the world's major observatories. While subsequent Swift observations have established the presence of a fading X-ray afterglow of relatively ordinary flux (GCN 3253), prompt follow-up observations from UV (GCN 3249) to optical (GCNs 3238, 3239, 3242) to JHK (GCN 3235) - reaching to increasingly deep limits from 7.1 sec to 1 hour after the burst - have established only upper limits to the afterglow flux in these bandpasses. As with previous events, this is likely due to some combination of host galaxy extinction and high redshift; since GRB050412 is the darkest known burst, unusually high redshift and/or high extinction is indicated. However, the five-arcsec Swift XRT position will not allow unique identification of a host galaxy. We therefore propose to make a single Chandra observation to derive a sub-arcsec position for GRB050412 from its X-ray afterglow.

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