AAS 207th Meeting, 8-12 January 2006
Session 19 GRB and SGR
Poster, Monday, 9:20am-7:00pm, January 9, 2006, Exhibit Hall

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[19.03] Prompt emission properties of the highest redshift GRB 050904 observed by Swift-BAT and Konus-Wind

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.

The author(s) of this abstract have provided an email address for comments about the abstract: parsons@milkyway.gsfc.nasa.gov

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