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A. M. Parsons (GSFC), T. Sakamoto, J. Cummings (GSFC/NRC), L. M. Barbier, S. D. Barthelmy, N. Gehrels, J. Tueller, T. Cline (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/ UMD), D. Hullinger (UMD), G. Sato (JAXA/ISAS), E. Fenimore, D. Palmer (Los Alamos National Lab.), R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, M. Ulanov, S. Golenetskii (Ioffe Physico-Technical Inst.), Swift-BAT Team, Konus-Wind Team
The Swift-Burst Alert Telescope (BAT) detected the most distant gamma-ray burst to date (GRB 050904) on September 4, 2005. A redshift of z = 6.29 was measured through the coordination of Swift's prompt burst position report and early follow-up observations with ground-based telescopes. The observation of GRB 050904 at such high redshift opens a new window for studying the death of a star at the edge of the universe as well as the nature of the early universe itself.
We report the prompt gamma-ray emission properties of GRB 050904 as simultaneously observed by both Swift-BAT and Konus-Wind. The combination of the Swift/BAT and Konus-Wind data produces the wide energy coverage (15 keV to 1 MeV) that is important for studies of the burst energetics.
We will discuss 1) the validity of the Epeak-Eiso relation and the Epeak-Egamma relation for this farthest burst; 2) the energy budget of X-ray flares observed by the Swift-X-Ray Telescope (XRT) in combination with the BAT data; and 3) the temporal behavior of GRB 050904 in comparison with other GRBs of known redshift.
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Bulletin of the American Astronomical Society, 37 #4
© 2005. The American Astronomical Soceity.