The AstroStat Slog » Dirichlet process http://hea-www.harvard.edu/AstroStat/slog Weaving together Astronomy+Statistics+Computer Science+Engineering+Intrumentation, far beyond the growing borders Fri, 09 Sep 2011 17:05:33 +0000 en-US hourly 1 http://wordpress.org/?v=3.4 [ArXiv] Three Classes of GRBs, July 21, 2007 http://hea-www.harvard.edu/AstroStat/slog/2007/arxiv-three-classes-of-grbs/ http://hea-www.harvard.edu/AstroStat/slog/2007/arxiv-three-classes-of-grbs/#comments Wed, 25 Jul 2007 07:22:52 +0000 hlee http://hea-www.harvard.edu/AstroStat/slog/2007/arxiv-three-classes-of-grbs-july-21-2007/ From arxiv/astro-ph:0705.4020v2
Statistical Evidence for Three classes of Gamma-ray Bursts by T. Chattopadhyay et. al.

In general, gamma-ray bursts (GRBs) are classified into two groups: long (>2 sec) and short (<2 sec) duration bursts. Nonetheless, there have been some studies including arxiv/astro-ph:0705.4020v2 that statistically proved the optimal existence of 3 clusters. The pioneer work of GRB clusterings was based on hierarchical clustering methods by Mukerjee et. al.(Three Types of Gamma-Ray Bursts)

The new feature of this article is that Chattopadhyay et. al. applied the k-means and the Dirichlet process model based clustering method to confirm three classes of GRBs. In addition, they investigated classes among 21 GRBs with known red shifts (Click for those GRBs).

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