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XRF 060428B: Observational evidence for a strongly lensed burst

Perley, DA, Bloom, JS, Butler, NR, Li, W and Chen, HW (2007) XRF 060428B: Observational evidence for a strongly lensed burst. In: AIP Conference Proceedings , 937. pp. 526-529. (Supernova 1987A: 20 Years After: Supernovae and Gamma-Ray Bursters, 19-23 February 2007, Aspen, Colorado, USA).

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Long-duration GRBs and X-ray flashes (XRFs; softer-spectrum brethren of long GRBs) are thought to occur following the core-collapse of massive stars. We report here on observations of a recent X-ray flash (XRF 060428B) that occurred 2.6 ″ in projection from the center of a massive red galaxy at redshift z=0.348, well within its detectable light. While initial probabilistic arguments suggested a physical connection, deep Keck imaging reveals a compact blue source at the burst position, likely a higher-redshift host galaxy. Since the observed offset is approximately equal to the Einstein radius of the foreground elliptical, we suggest that XRF 060428B may have been strongly gravitationally lensed, allowing us to detect an underluminous burst at high-z. This would naturally explain the otherwise coincidental proximity to a nearby galaxy. © 2007 American Institute of Physics.

Item Type: Conference or Workshop Item (Paper)
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: AIP Publishing
Date Deposited: 24 May 2017 08:41
Last Modified: 13 Apr 2022 15:15
DOI or ID number: 10.1063/1.3682955
URI: https://researchonline.ljmu.ac.uk/id/eprint/6561
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