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  • grb 090618: different pulse temporal and spectral characteristics within a burst

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    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 1189
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    grb 090618 was simultaneously detected by swift-bat and fermi-gbm. its light curve shows two emission episodes consisting of four prominent pulses. the pulse in the first episode (episode a) has a smoother morphology than the three pulses in the second episode (episode b). using the pulse peak-fit method, we have performed a detailed analysis of the temporal and spectral characteristics of these four pulses and found out that the first pulse (pulse a) exhibits distinctly different properties than the others in episode b (pulses b1, b2 and b3) in the following aspects. (i) both the pulse width (ω) and the rise-to-decay ratio of pulse (r/d, pulse asymmetry) in grb 090618 are found to be energy-dependent. the indices of the power-law correlation between ω and e for the pulses in episode b however are larger than that in episode a. moreover the pulses b1, b2 and b3 tend to be more symmetric at the higher energy bands while the pulse a displays a reverse trend. (ii) pulse a shows a hard-to-soft spectral evolution pattern, while the three pulses in the episode b follow the light curve trend. (iii) pulse a has a longer lag than the pulses b1, b2 and b3. the mechanism which causes the different pulse characteristics within one single grb is unclear.

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