2005/08/23 by C. Guidorzi, Cristiano Guidorzi · 1 citation
Physics and Astronomy · #Astro and Planetary Science #Astronomy #Astrophysics #Galaxy #Gamma-ray burst #Gamma-ray bursts and supernovae #Luminosity #Physics #Power law #Pulsars and Gravitational Waves Research #Redshift #Statistics #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2005.09545.x
published as Mon.Not.Roy.Astron.Soc. 364 (2005) 163-168 · MNRAS, accepted, 6 pages, 4 figures
arxiv created 2005/08/23 · openalex publication_date 2005/10/10 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We test the correlation found by Reichart et al. between time variability and peak luminosity of gamma-ray bursts (GRBs). Recently, Guidorzi et al. found that this still holds for a sample of 32 GRBs with spectroscopic redshift, although with a larger scatter than that originally found by Reichart et al. However, Guidorzi et al. also found that a power law does not provide a good description of that. We report on the same test performed on a sample of 551 burst and transient source experiment (BATSE) GRBs with a significant measure of variability assuming the pseudo-redshifts derived by Band et al. (1186 GRBs) through the anticorrelation between spectral lag and peak luminosity. We still find a correlation between variability as defined by Reichart et al. and peak luminosity with higher significance. However, this subsample of BATSE GRBs shows a higher scatter around the best-fitting power law than that found by Reichart et al. in the variability/peak luminosity space. This is in agreement with the result found by Guidorzi et al. on a sample of 32 GRBs with measured redshift. These results confirm that a power law does not provide a satisfactory description for all the GRBs, in contrast with the original findings by Reichart et al.