The host galaxy cluster of the short gamma-ray burst GRB 050509B

Abstract

The first arcsecond localization of a short gamma-ray burst, GRB 050509B, has enabled detailed studies of a short burst environment. We here report on studies of the environment of GRB 050509B using the Swift X-ray Telescope (XRT). The XRT error circle of the burst overlaps with an elliptical galaxy in the cluster of galaxies ZwCl 1234.0+02916. Based on the measured X-ray flux of the cluster we estimate that the probability for a chance superposition of GRB 050509B and a cluster at least as X-ray bright as this cluster is $<2\times 10^{-3}$, presenting the first strong case of a short burst located in a cluster of galaxies. We also consider the case for GRB 050509B being located behind ZwCl 1234.0+02916 and gravitationally lensed. From the velocity dispersion of the elliptical galaxy and the temperature of hot intracluster gas, we model the mass distribution in the elliptical galaxy and the cluster, and calculate the gravitational lensing magnification within the XRT error circle. We find that, if GRB050509B would be positioned significantly behind the cluster, it is most likely magnified by a factor less than two, but that the burst could be strongly lensed if it is positioned within 2 arcsec of the center of the bright elliptical galaxy. Further mapping of arcsecond size short burst error boxes is a new promising route to determine the spatial distribution of old stars throughout the Universe.

arXiv commentTo appear in ApJL

References in corpus (16)

• The Physics of Gamma-Ray Bursts
• The Cosmic Baryon Budget
• A short gamma-ray burst apparently asssociated with an elliptical galaxy at redshift z=0.225
• Properties of the X-ray brightest Abell-type clusters of galaxies (XBACs) from ROSAT All-Sky Survey data --- I. The sample
• The structural and scaling properties of nearby galaxy clusters - II. The M-T relation
• The ROSAT Deep Cluster Survey: the X-ray Luminosity Function out to z=0.8
• Galactic distribution of merging neutron stars and black holes - prospects for short GRB progenitors and LIGO/VIRGO
• Lack of Evolution in the Iron Abundance in Clusters of Galaxies and Implications for the Global Star Formation Rate at High Redshift
• GRB 050509B: Constraints on short gamma-ray burst models
• The RASS-SDSS Galaxy Cluster Survey. III. Scaling relations of galaxy clusters
• The Northern Sky Optical Cluster Survey II: An Objective Cluster Catalog for 5800 Square Degrees
• ASCA and ROSAT observations of nearby cluster cooling flows
• A compact binary merger model for the short, hard GRB 050509b
• Afterglow upper limits for four short duration, hard spectrum gamma-ray bursts
• New Evidence for The Cosmological Origin of Gamma-Ray Bursts
• No Evidence for Gamma-Ray Burst/Abell Cluster or Gamma- Ray Burst/Radio-Quiet Quasar Correlations

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• A case of mistaken identity? GRB 060912A and the nature of the long -- short GRB divide
• On the nature of the short duration GRB 050906
• Galaxy Clusters Associated with Short GRBs. I. The Fields of GRBs 050709, 050724, 050911 and 051221a
• The short-duration GRB 050724 host galaxy in the context of the long-duration GRB hosts
• Halo Retention and Evolution of Coalescing Compact Binaries in Cosmological Simulations of Structure Formation: Implications for Short Gamma-Ray Bursts
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• Connecting GRBs and galaxies: the probability of chance coincidence
• On the correlation of Short Gamma--Ray Bursts and Clusters of galaxies
• The Burst Cluster: Dark Matter in a Cluster Merger Associated with the Short Gamma Ray Burst, GRB 050509B
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