NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Confirmation of the E(sup src)(sub Peak)-E(sub iso) (Amati) relation from the x-ray flash XRF 050416A observed by the Swift burst alert telescopeWe report Swift Burst Alert Telescope (BAT) observations of the X-ray flash (XRF) XRF 050416A. The fluence ratio between the 15-25 and 25-50 keV energy bands of this event is 1.5, thus making it the softest gamma-ray burst (GRB) observed by BAT so far. The spectrum is well fitted by a Band function with E(sup obs)(sub peak) of 15.0(sup +2.3)(sub -2.7) keV. Assuming the redshift of the host galaxy (z = 0.6535), the isotropic equivalent radiated energy E(sub iso) and the peak energy at the GRB rest frame (E(sup src)(sub peak)) of XRF 050416A are not only consistent with the correlation found by Amati et al. and extended to XRFs by Sakamoto et al. but also fill in the gap of this relation around the 30-80 keV range of E(sup src)(sub peak). This result tightens the validity of the E(sup src)(sub Peak)-E(sup src)(sub peak) relation from XRFs to GRBs. We also find that the jet break time estimated using the empirical relation between E(sup src)(sub peak) and the collimation corrected energy E(sub gamma), is inconsistent with the afterglow observation by the Swift X-Ray Telescope. This could be due to the extra external shock emission overlaid around the jet break time or to the nonexistence of a jet break feature for XRFs, which might be a further challenge for GRB jet emission models and XRF/GRB unification scenarios.
Document ID
20060013024
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Sakamoti, T.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Barbier, L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Barthelmy, S. D.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Cummings, J. R.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Fenimore, E. E.
(Los Alamos National Lab. NM, United States)
Gehrels, N.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hullinger, D.
(Maryland Univ. College Park, MD, United States)
Krimm, H. A.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Markwardt, C. B.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2006
Publication Information
Publication: The Astrophysical Journal
Volume: 36
Subject Category
Astronomy
Distribution Limits
Public
Copyright
Other

Available Downloads

There are no available downloads for this record.
No Preview Available