Analysis of the observed and intrinsic durations of Swift/BAT gamma-ray bursts
Abstract
The duration distribution of 947 GRBs observed by Swift/BAT, as well as its subsample of 347 events with measured redshift, allowing to examine the durations in both the observer and rest frames, are examined. Using a maximum log-likelihood method, mixtures of two and three standard Gaussians are fitted to each sample, and the adequate model is chosen based on the value of the difference in the log-likelihoods, Akaike information criterion and Bayesian information criterion. It is found that a two-Gaussian is a better description than a three-Gaussian, and that the presumed intermediate-duration class is unlikely to be present in the Swift duration data.
- Publication:
-
New Astronomy
- Pub Date:
- July 2016
- DOI:
- 10.1016/j.newast.2015.12.006
- arXiv:
- arXiv:1511.08925
- Bibcode:
- 2016NewA...46...54T
- Keywords:
-
- Gamma-ray burst: general;
- Methods: data analysis;
- Methods: statistical;
- Astrophysics - High Energy Astrophysical Phenomena;
- Astrophysics - Cosmology and Nongalactic Astrophysics;
- High Energy Physics - Phenomenology;
- Physics - Space Physics
- E-Print:
- 7 pages, 5 figures