http://arxiv.org/abs/1712.08123
Determining the kinds of Gamma Ray Bursts has been of interest to astronomers for many years. We analyzed 1599 GRBs from the BATSE 4Br catalogue using $t$-mixtures-model-based clustering on all nine observed parameters ($T_{50}$, $T_{90}$, $F_1$, $F_2$, $F_3$, $F_4$, $P_{64}$, $P_{256}$, $P_{1024}$) and found evidence of five homogeneous groups of Gamma Ray Bursts. Our results further refine the findings of Chattopadhyay and Maitra (2017) by providing groups that are more distinct. We also classify 374 GRBs in the BATSE catalog that have incomplete information in some of the observed variables (mainly the four time integrated fluences $F_1$, $F_2$, $F_3$ and $F_4$) to the five groups obtained using the 1599 GRBs having complete information in all the observed variables. We found that GRBs having incomplete parameter reads have higher peak flux density compared to the bursts with all observed parameters; thus bursts with incomplete observations are mostly high energy bursts.
S. Chattopadhyay and R. Maitra
Fri, 22 Dec 17
4/52
Comments: 13 pages, 9 figures, 6 tables
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