Afterglow and Environment of the High-redshift GRB 050904

Details Afterglow and Environment of the High-redshift GRB 050904 Afterglow and Environment of the High-redshift GRB 050904

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20922706g&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #227.06; Bulletin of the American Astronomical Society,

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GRB 050904, at redshift z=6.3, is the highest-redshift gamma-ray burst detected to-date. Apart from its extreme redshift, which places it in the first billion years of cosmic history, this event is interesting in two additional respects: First, it exhibited a fast-evolving flare in the X-ray and near-infrared (NIR) bands that peaked approximately 450 seconds after the gamma-ray trigger; and second, its afterglow exhibited a relatively slow decay in the NIR from 0.5 to 1.0 days after the burst, coincident with repeated and energetic flaring activity in the X-ray band. We have made a complete analysis of the available X-ray, NIR, and radio afterglow observations, utilizing afterglow models that incorporate a range of physical effects not previously considered in addressing this or any other GRB afterglow. In particular, using a Markov Chain Monte Carlo method, we investigate the possibility that the early flare is due to synchrotron and inverse Compton emission from the reverse shock regions of the outflow, and we suggest that inverse Compton interactions of X-ray flare photons suppress the NIR flux, accounting for the interval of slow decay in the NIR. We will present and discuss in detail the results of our model fits, which imply that GRB 050904 had substantially greater (beaming-corrected) kinetic energy than typical GRBs at low redshift.

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