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• W3105295823 endingPage "137" @default.
• W3105295823 startingPage "137" @default.
• W3105295823 abstract "The radiative process responsible for gamma-ray burst (GRB) prompt emission has not been identified yet. If dominated by fast-cooling synchrotron radiation, the part of the spectrum immediately below the peak energy should display a power-law behavior with slope , which breaks to a higher value (i.e., to a harder spectral shape) at lower energies. Prompt emission spectral data (usually available down to keV) are consistent with one single power-law behavior below the peak, with typical slope , higher than (and then inconsistent with) the expected value . To better characterize the spectral shape at low energy, we analyzed 14 GRBs for which the Swift X-ray Telescope started observations during the prompt. When available, Fermi-GBM observations have been included in the analysis. For 67% of the spectra, models that usually give a satisfactory description of the prompt (e.g., the Band model) fail to reproduce the 0.5–1000 keV spectra: low-energy data outline the presence of a spectral break around a few keV. We then introduce an empirical fitting function that includes a low-energy power law , a break energy , a second power law , and a peak energy . We find (), (), (), and (). The values and are very close to expectations from synchrotron radiation. In this context, corresponds to the cooling break frequency. The relatively small ratio suggests a regime of moderately fast cooling, which might solve the long-lasting problem of the apparent inconsistency between measured and predicted low-energy spectral index." @default.
• W3105295823 created "2020-11-23" @default.
• W3105295823 creator A5036418646 @default.
• W3105295823 creator A5043299385 @default.
• W3105295823 creator A5044947637 @default.
• W3105295823 creator A5060557881 @default.
• W3105295823 date "2017-09-11" @default.
• W3105295823 modified "2023-10-18" @default.
• W3105295823 title "Detection of Low-energy Breaks in Gamma-Ray Burst Prompt Emission Spectra" @default.
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• W3105295823 doi "https://doi.org/10.3847/1538-4357/aa831e" @default.
• W3105295823 hasPublicationYear "2017" @default.
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