Статья

Evidence of Exponential Decay Emission in the<i>Swift</i>Gamma‐Ray Bursts

T. SakamotoNASA Goddard Space Flight Center, Greenbelt, MD 20771J. E. HillCRESST NASA Goddard Space Flight Center, Greenbelt, MD 20771Ryo YamazakiDepartment of Physics, Hiroshima University, Higashi-Hiroshima, Hiroshima, 739-8526, JapanL. AngeliniNASA Goddard Space Flight Center, Greenbelt, MD 20771H. A. KrimmCRESST NASA Goddard Space Flight Center, Greenbelt, MD 20771G. SatoInstitute of Space and Astronautical Science, JAXA, Kanagawa 229-8510, JapanSimon R. SwindellDepartment of Physics, North Carolina Agricultural and Technical State University, 1601 East Market Street, Greensboro, NC 27411Kentaro TakamiDepartment of Physics, Hiroshima University, Higashi-Hiroshima, Hiroshima, 739-8526, JapanJ. P. OsborneDepartment of Physics and Astronomy, University of Leicester, LE1, 7RH, UK

2007en

ABI

Аннотация

We present a systematic study of the steep decay emission from gamma-ray bursts (GRBs) observed by the Swift X-Ray Telescope (XRT). In contrast to the analysis described in recent literature, we produce composite Burst Alert Telescope (BAT) and XRT light curves by extrapolating the XRT data (2-10 keV) into the BAT energy range (15-25 keV) rather than extrapolating the BAT data into the XRT energy band (0.3-10 keV). Based on the fits to the composite light curves, we have confirmed the existence of an exponential decay component which smoothly connects the BAT prompt data to the XRT steep decay for several GRBs. We also find that the XRT steep decay for some of the bursts can be well fit by a combination of a power-law with an exponential decay model. We discuss this exponential component within the frame work of both the internal and the external shock model.

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Идентификаторы

DOI: 10.1086/521640

Цитирования и источники

Цитирований: 2Использованных источников: 0

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