The Decaying X-Ray Afterglow of GRB021004

Details The Decaying X-Ray Afterglow of GRB021004 The Decaying X-Ray Afterglow of GRB021004

Sep 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001cxo..prop.1351s&link_type=abstract

Chandra Proposal ID #03508130

Astronomy and Astrophysics

Astronomy

Chandra Proposal Id #03508130

Scientific paper

Observations of the afterglow of GRB021004 have provided us with a unique opportunity to study the detailed physical conditions of the burst environment. The optical light curves are densely sampled since ~9.5 minutes after the burst and consist of multiple bumps and wiggles on various timescales. The X-ray light curve, however, is sampled only during an earlier Chandra HETG observation, which lasted ~1 day starting from ~20.5 hours after the burst. The temporal slope during this observation was determined to be -1.0 +/- 0.2, and there was no obvious change in spectral shape throughout the observation. As stressed by Heyl & Perna (astro-ph/021004), the X-ray light curve is particularly important for distinguishing between the various possible emission models. We propose to measure the X-ray flux and the spectral shape of GRB021004 during its late afterglow phases to address the long-term behaviour of this spectacular afterglow.

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