Report
SWIFT Discovery of Gamma-ray Bursts without Jet Break Feature in their X-ray Afterglows
| العنوان: | SWIFT Discovery of Gamma-ray Bursts without Jet Break Feature in their X-ray Afterglows |
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| المؤلفون: | Sato, G, Yamazaki, R, Sakamoto, T, Takahashi, T, Nakazawa, K, Nakamura, T, Toma, K, Hullinger, D, Tashiro, M, Parsons, A. M, Krimm, H. A, Barthelmy, S. D, Gehrels, N, Burrows, D. N, O'Brien, P. T, Osborne, J. P, Chincarini, G, Lamb, D. Q |
| بيانات النشر: | United States: NASA Center for Aerospace Information (CASI), 2007. |
| سنة النشر: | 2007 |
| مصطلحات موضوعية: | Astronomy |
| الوصف: | We analyze Swift gamma-ray bursts (GRBs) and X-ray afterglows for three GRBs with spectroscopic redshift determinations - GRB 050401, XRF 050416a, and GRB 050525a. We find that the relation between spectral peak energy and isotropic energy of prompt emissions (the Amati relation) is consistent with that for the bursts observed in pre-Swift era. However, we find that the X-ray afterglow lightcurves, which extend up to 10 - 70 days, show no sign of the jet break that is expected in the standard framework of collimated outflows. We do so by showing that none of the X-ray afterglow lightcurves in our sample satisfies the relation between the spectral and temporal indices that is predicted for the phase after jet break. The jet break time can be predicted by inverting the tight empirical relation between the peak energy of the spectrum and the collimation-corrected energy of the prompt emission (the Ghirlanda relation). We find that there are no temporal breaks within the predicted time intervals in X-ray band. This requires either that the Ghirlanda relation has a larger scatter than previously thought, that the temporal break in X-rays is masked by some additional source of X-ray emission, or that it does not happen because of some unknown reason. |
| نوع الوثيقة: | Report |
| اللغة: | English |
| URL الوصول: | https://ntrs.nasa.gov/citations/20070017426 |
| ملاحظات: | MOE-14079207 MOE-14047212 NCC5-637 MOE-14204024 MOE-18740153 |
| رقم الانضمام: | edsnas.20070017426 |
| قاعدة البيانات: | NASA Technical Reports |
| الوصف غير متاح. |