The Swift satellite and redshifts of long gamma-ray bursts

Details The Swift satellite and redshifts of long gamma-ray bursts The Swift satellite and redshifts of long gamma-ray bursts

2006-04-14

arxiv.org/abs/astro-ph/0604326v1

Astron.Astrophys. 453 (2006) 797-800

Astronomy and Astrophysics

Astrophysics

4 pages, accepted as an A&A Research Note

Scientific paper

10.1051/0004-6361:20054322

Until 6 October 2005 sixteen redshifts have been measured of long gamma-ray bursts discovered by the Swift satellite. Further 45 redshifts have been measured of the long gamma-ray bursts discovered by other satellites. Here we perform five statistical tests comparing the redshift distributions of these two samples assuming - as the null hypothesis - identical distribution for the two samples. Three tests (Student's $t$-test, Mann-Whitney test, Kolmogorov-Smirnov test) reject the null hypothesis on the significance levels between 97.19 and 98.55%. Two different comparisons of the medians show extreme $(99.78-99.99994)$% significance levels of rejection. This means that the redshifts of the Swift sample and the redshifts of the non-Swift sample are distributed differently - in the Swift sample the redshifts are on average larger. This statistical result suggests that the long GRBs should on average be at the higher redshifts of the Swift sample.

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