A comparison of temporal properties of short and long gamma-ray bursts

作者：Zhang Z B^*; Xie G Z

来源：Astrophysics and Space Science, 2007, 310(1-2): 19-23.

DOI：10.1007/s10509-007-9390-2

• Gamma-rays : bursts
• Methods : data analysis

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.

• 出版日期2007-7
• 单位中国科学院; 中国科学院国家天文台; 中国科学院云南天文台