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Global Properties of X-Ray Flashes and X-Ray-Rich GRBs Observed by SwiftWe describe and discuss the spectral and temporal characteristics of the prompt emission and X-ray afterglow emission of X-ray flashes (XRFs) detected and observed by Swift between December 2005 and September 2006. We compare these characteristics to a sample of X-ray rich gamma-ray bursts (XRRs) and conventional classical gamma-ray bursts (C-GRBs)observed during the same period. We confirm the correlation between Epeak and fluence noted by others and find further evidence that XRFs and C-GRBs form a continuum. We also confirmed that our known redshift samples are consistent with the correlation between the peak energy (Epeak) and the isotropic radiated energy (Eiso), so called the Epeak-Eiso relation. The spectral properties of X-ray afterglows are similar to those of gamma-ray burst afterglows, but the temporal properties of the two classes are quite different. We found that the light curves of C-GRBs afterglow show a break to steeper indices (shallow-to-steep break) at much earlier times than do XRF afterglows. Moreover, the overall luminosity of X-ray afterglows of XRFs are systematically smaller by a factor of two or more compared with that of C-GRBs. These distinct differences in the X-ray afterglow between XRFs and C-GRBs are key to understanding not only a mysterious shallow-to-steep phase in the X-ray afterglow but also the unique nature of XRFs.
Document ID
20070034820
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Sakamoto, T.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Yamazaki, R.
(Hiroshima Univ. Japan)
Cummings, J.
(Maryland Univ. MD, United States)
Krimm, H.
(Universities Space Research Association United States)
Parsons, A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hullinger, D.
(Brigham Young Univ. Rexburg, ID, United States)
Barbier, L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fenimore, E.
(Los Alamos National Lab. NM, United States)
Markwardt, C.
(Maryland Univ. MD, United States)
Tueller, J.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Sato, G.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Barthelmy, S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Gehrels, N.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Palmer, D.
(Los Alamos National Lab. NM, United States)
Date Acquired
August 24, 2013
Publication Date
May 27, 2007
Subject Category
Astronomy
Meeting Information
Meeting: American Astronomical Society 210th Hawaii Meeting
Location: Honolulu, HI
Country: United States
Start Date: May 27, 2007
End Date: May 31, 2007
Funding Number(s)
CONTRACT_GRANT: NCC5-637
Distribution Limits
Public
Copyright
Other

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