Does the GRB Duration Depend on Redshift?

TL;DR

This study investigates the relationship between gamma-ray burst (GRB) durations and their redshifts, analyzing their distribution to identify any correlations or distinct regions, especially focusing on short GRBs.

Contribution

The paper provides a two-dimensional analysis of GRB duration and redshift, identifying suspicious regions but finding no significant correlation beyond the known short GRB region.

Findings

Short GRBs are closer than long GRBs.

No significant variation in redshift across different duration ranges.

Identified suspicious areas in the distribution, but no new correlations found.

Abstract

Several hundred gamma-ray burst (GRB) redshifts have been determined to date. One of the other important properties-besides the distance-of the GRBs is the duration of the burst. In this paper, we analyse these two important quantities of the phenomena. In this paper, we map the two-dimensional distribution and explore some suspicious areas. As it is well known that the short GRBs are closer than the others, we search for parts in the Universe where the GRB duration is different from the others. We also analyse whether there are any ranges in the duration where the redshifts differ. We find some suspicious areas, however, no other significant region was found than the short GRB region.