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Title:
Confirmation of the Esrcpeak-Eiso (Amati) Relation from the X-Ray Flash XRF 050416AObserved by the Swift Burst Alert Telescope
Authors:
Sakamoto, T.; Barbier, L.; Barthelmy, S. D.; Cummings, J. R.; Fenimore, E. E.; Gehrels, N.; Hullinger, D.; Krimm, H. A.; Markwardt, C. B.; Palmer, D. M.; Parsons, A. M.; Sato, G.; Tueller, J.
Affiliation:
AA(NASA Goddard Space Flight Center, Code 661, Greenbelt, MD 20771.; National Research Council, 2101 Constitution Avenue, NW, TJ2114, Washington, DC 20418.), AB(NASA Goddard Space Flight Center, Code 661, Greenbelt, MD 20771.), AC(NASA Goddard Space Flight Center, Code 661, Greenbelt, MD 20771.), AD(NASA Goddard Space Flight Center, Code 661, Greenbelt, MD 20771.; National Research Council, 2101 Constitution Avenue, NW, TJ2114, Washington, DC 20418.), AE(Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545.), AF(NASA Goddard Space Flight Center, Code 661, Greenbelt, MD 20771.), AG(Department of Physics, University of Maryland, College Park, MD 20742.), AH(NASA Goddard Space Flight Center, Code 661, Greenbelt, MD 20771.; Universities Space Research Association, 10211 Wincopin Circle, Suite 500, Columbia, MD 21044-3432.), AI(NASA Goddard Space Flight Center, Code 661, Greenbelt, MD 20771.; Department of Physics, University of Maryland, College Park, MD 20742.), AJ(Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545.), AK(NASA Goddard Space Flight Center, Code 661, Greenbelt, MD 20771.), AL(Institute of Space and Astronautical Science, JAXA, Kanagawa 229-8510, Japan.), AM(NASA Goddard Space Flight Center, Code 661, Greenbelt, MD 20771.)
Publication:
The Astrophysical Journal, Volume 636, Issue 2, pp. L73-L76. (ApJ Homepage)
Publication Date:
01/2006
Origin:
UCP
ApJ Keywords:
Gamma Rays: Bursts
DOI:
10.1086/500261
Bibliographic Code:
2006ApJ...636L..73S

Abstract

We 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 1.1, thus making it the softest gamma-ray burst (GRB) observed by BAT so far. The spectrum is well fitted by a Band function with Eobspeak of 15.0+2.3-2.7 keV. Assuming the redshift of the host galaxy (z=0.6535), the isotropic equivalent radiated energy Eiso and the peak energy at the GRB rest frame (Esrcpeak) 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 Esrcpeak. This result tightens the validity of the Esrcpeak-Eiso relation from XRFs to GRBs. We also find that the jet break time estimated using the empirical relation between Esrcpeak and the collimation corrected energy Eγ 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.
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