Not enough evidence to support the correlation between gamma-ray bursts and foreground galaxy clusters in the Swift Era
Abstract
The correlation between distant Gamma-Ray Bursts (GRBs) and foreground galaxy clusters is re-examined by using the well localized (with an accuracy down to a few arcsec) Swift/XRT GRBs. The galaxy clusters are compiled from both the X-ray selected ROSAT brightest cluster sample (BCS) and the BCS extension by requiring δ >= 0° and b >= 20°. The Swift/XRT GRBs fulfilling the above selection criteria are cross-correlated with the clusters. Both Nearest-Neighbor analysis and the angular two-point cross-correlation function show that there is not enough evidence supporting the correlation between the GRBs and foreground clusters. We suggest that the non-correlation is probably related to the GRB number-flux relation slope.
- Publication:
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Research in Astronomy and Astrophysics
- Pub Date:
- June 2010
- DOI:
- 10.1088/1674-4527/10/6/003
- arXiv:
- arXiv:1003.5052
- Bibcode:
- 2010RAA....10..533W
- Keywords:
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- Astrophysics - Cosmology and Nongalactic Astrophysics
- E-Print:
- 8 pages, 5 figures, accepted by RAA