Abstract
A joint spectral analysis for early bright X-ray flares that were simultaneously observed with Swift BAT and XRT are present. Both BAT and XRT lightcurves of these flares are correlated. Our joint spectral analysis shows that the radiations in the two energy bands are from the same spectral component, which can be well fitted with a single power-law. Except for the flares in GRBs 060904B and 100906A, the photon spectral indices are <2.0, indicating the peak energies (E p) of the prompt γ-rays should be above the high energy end of the BAT band.
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Notes
X-ray lightcurves of a small fraction of GRBs are a featureless single power-law (Liang et al. 2009).
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Acknowledgements
This work made use of data supplied by the UK Swift Science Data Centre at the University of Leicester. It is supported by the ‘973’ Program of China (2014CB845800), the National Natural Science Foundation of China (Grant No. 11025313), Guangxi Science Foundation (2013GXNSFFA019001), Key Laboratory for the Structure and Evolution of Celestial Objects of Chinese Academy of Sciences, and the Strategic Priority Research Program “The Emergence of Cosmological Structures” of the Chinese Academy of Sciences (No. XDB09000000).
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Peng, FK., Hu, YD., Wang, XG. et al. Joint Spectral Analysis for Early Bright X-ray Flares of γ-Ray Bursts with Swift BAT and XRT Data. J Astrophys Astron 35, 423–427 (2014). https://doi.org/10.1007/s12036-014-9246-4
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DOI: https://doi.org/10.1007/s12036-014-9246-4