A comparison of temporal properties of short and long gamma-ray bursts |
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| Authors: | Z B Zhang G Z Xie |
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| Institution: | (1) Yunnan Observatory, National Astronomical Observatories, Chinese Academy of Sciences, P.O., Box 110, Kunming, 650011, China;(2) The Graduate School of the Chinese Academy of Sciences, Beijing, 10049, China |
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| Abstract: | In this paper, we have performed a temporal analysis of single pulses from short (46) and long (51) gamma-ray bursts (GRBs)
to investigate possible differences in their properties. In particular we pay detailed attention to the asymmetry of pulses.
We find that the asymmetry ratio of short GRB pulses clusters around 0.81 and that these pulses are on average more symmetric
than those from long GRBs, which have an average value of 0.47. In addition we note that the pulses in short GRBs display
exponential rises and fast decays (ERFD) in comparison the fast rise exponential decays (FRED) pulses of long GRBs. The asymmetry
ratio does not depend on the full width at half maximum (FWHM) and does not vary with energy channel. Moreover, there is a
general trend for slower pulses to be more asymmetric. Finally, we deduce that the asymmetry could be used to probe the emission
mechanisms of GRBs. |
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| Keywords: | Gamma-rays: bursts Methods: data analysis |
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