Summary
This paper reports comprehensive analysis of gamma-ray burst duration distributions and their spectral properties from nearly 1500 events observed by the Suzaku Wide-band All-sky Monitor between 2005 and 2010. The study reveals clearly bimodal duration distributions at lower energies, confirms the short–hard/long–soft GRB classification, and identifies key instrumental and physical factors explaining observed differences in short:long event ratios across eight independent GRB detection instruments. The findings demonstrate the importance of accounting for energy dependence and instrumental sensitivity when comparing GRB population statistics across different missions.
Key measures
T90 and T50 duration distributions; spectral hardness; short:long event ratio; power-law index of duration versus energy (−0.058); comparison across energy ranges (50–120, 120–250, 250–550, 550–5000 keV)
Outcomes reported
The study analysed T90 and T50 duration distributions of 1464 gamma-ray bursts observed by the Suzaku Wide-band All-sky Monitor, revealing bimodal distributions across three energy ranges and their relationships with spectral hardness. Comparative analysis with eight other GRB instruments demonstrated variations in short:long event ratios attributable to energy dependence, trigger mechanisms, and detection sensitivity differences.
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