Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20715804f&link_type=abstract
American Astronomical Society Meeting 207, #158.04; Bulletin of the American Astronomical Society, Vol. 37, p.1418
Astronomy and Astrophysics
Astronomy
1
Scientific paper
I will discuss our discovery, sub-arcsecond localization, and multiwavelength follow-up of the afterglow of GRB 050709. This was the first short-hard burst (SHB) with a sub-arcsecond position and the first with a detected optical afterglow. Gemini spectroscopy reveals its host to be a subluminous star-forming galaxy at redshift z=0.16. The burst redshift, energy in prompt emission, and energy in relativistic ejecta are all well below the median values of these properties for the long-duration GRBs. At the same time, the values coincide well with previous inferences drawn from the luminosity function of BATSE SHBs. Our month-long imaging campaign with the Hubble Space Telescope places the afterglow in the context of its host galaxy and tracks its decay to I AB>28 mag. We observe the first jet break seen for any SHB, measure the burst collimation angle, and set stringent (extinction-free) limits on the brightness of any associated supernova. Based on these observations, we consider the binary merger scenario for SHBs strongly favored over alternate models.
Fox Derek B.
React GRB Team
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