Other
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aipc..937..526p&link_type=abstract
SUPERNOVA 1987A: 20 YEARS AFTER: Supernovae and Gamma-Ray Bursters. AIP Conference Proceedings, Volume 937, pp. 526-529 (2007).
Other
Astronomical Observations, Gamma-Ray Sources, Gamma-Ray Bursts, Gravitational Lenses And Luminous Arcs, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies
Scientific paper
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.
Bloom Josh S.
Butler Nathaniel R.
Chen How-Wei
Li Wangrong
Perley Daniel A.
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