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Georgia Journal of Science

Article Title

THE EFFECT OF THE HUBBLE CONSTANT AND ENERGY INDICES α AND ß ON THE MEASURED GRBS REDSHIFT DISTRIBUTION**

Abstract

Gamma-ray bursts (GRBs) are extremely energetic bursts that can last from milliseconds to hours. They are divided into two categories based on their duration: short and long GRBs. Long GRBs generally result from the death of massive stars, implying that GRB activity should have a correlation with star formation rate. Le & Mehta (2017) show that such a relationship is possible, and their analysis also indicates that an excess of LGRBs exist below a redshift of 2 in the Swift redshift distribution. In this work, the ΛCDM cosmology with a current Hubble constant is assumed, and the GRB model depends on the low- and high-energy indices α and β of the GRB power-law spectrum, where the accepted values are currently assumed to be constants. Current observations have indicated that the observed Hubble constant H0 is in question, hence to understand the origin of this excess of low-redshift LGRBs, first the effect of the observed Hubble constant on the outcome of the calculated distribution will be explored. Then we examine whether the values of α and β depend on redshift. The results of the study will be presented at this meeting.

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