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- W2950953819 abstract "In this paper, we randomly selected a sample (sample 1) of long gamma-ray bursts, with its size being the same as that of the short burst group (sample 2) (N=500), from the Current BATSE Bursts Catalog. We randomly selected a short burst and assigned its T90 to each of these long bursts. We thus constructed a long burst sample with both the sample size and the distribution of T90 being the same as those of the short burst sample obtained from the Current BATSE Bursts Catalog. Then we calculated the hardness ratio ($hr_{T}$) over the assigned T90 for the long bursts and over their own T90 for the shout bursts, and studied the relation between the hardness ratio and the corresponding T90 for these two samples. We also calculated the hardness ratio ($hr_{t}$) over the randomly selected 64 ms time intervals within the T90, and investigated the relation between this hardness ratio and the selected 64 ms time interval. In addition, the $hr_{t}$ within and beyond the first 2 seconds for all the long bursts (sample 3; N=1541) were also investigated. We found that the KS probabilities of the distributions of the $hr_{T}$ (7.15337E-15) and $hr_{t}$ (9.54833E-10) for samples 1 and 2 are very small, and the average value of $hr_{T}$ and $hr_{t}$ of short bursts are obviously larger than that of the long bursts. The correlations between log$hr_{T}$ and logT90, and between log$hr_{t}$ and log t, for samples 1 and 2 are different. These show that short and long bursts in the first 2 seconds have different characters and they probably originate from different progenitors. For sample 3, for the two time intervals, the KS probability is 5.35828E-5, which suggests that the hardness ratios in different time intervals for long bursts are also different." @default.
- W2950953819 created "2019-06-27" @default.
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- W2950953819 date "2005-07-02" @default.
- W2950953819 modified "2023-09-27" @default.
- W2950953819 title "Relation between the hardness ratio and time in the first 2 seconds for compatible samples of short and long gamma-ray bursts" @default.
- W2950953819 doi "https://doi.org/10.1111/j.1365-2966-2005.08794.x" @default.
- W2950953819 hasPublicationYear "2005" @default.
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