• DOI:10.1086/498107
• Corpus ID: 5309369

Closing in on a Short-Hard Burst Progenitor: Constraints from Early-Time Optical Imaging and Spectroscopy of a Possible Host Galaxy of GRB 050509b

@article{Bloom2005ClosingIO,
  title={Closing in on a Short-Hard Burst Progenitor: Constraints from Early-Time Optical Imaging and Spectroscopy of a Possible Host Galaxy of GRB 050509b},
  author={Joshua S. Bloom and Jason Xavier Prochaska and David Pooley and Cullen H. Blake and Ryan J. Foley and Saurabh W. Jha and Enrico Ramirez-Ruiz and J. Granot and Alexei V. Filippenko and Steinn Sigurdsson and Aaron J. Barth and H.-W. Chen and Michael C. Cooper and Emilio E. Falco and R. R. Gal and Brian F. Gerke and Michael D. Gladders and Jenny E. Greene and J. Hennanwi and Luis C. Ho and Kevin Hurley and Benjamin P. Koester and W. D. Li and Lori M. Lubin and Jeffrey A. Newman and Daniel A. Perley and Gordon Squires and W. Michael Wood-Vasey},
  journal={The Astrophysical Journal},
  year={2005},
  volume={638},
  pages={354 - 368}
}

• J. Bloom, J. Prochaska, +25 authors W. Wood-Vasey
• Published 24 May 2005
• Physics
• The Astrophysical Journal

The localization of the short-duration, hard-spectrum gamma-ray burst GRB 050509b by the Swift satellite was a watershed event. We report the discovery of the probable host galaxy, a bright elliptical galaxy at z = 0.2248. This is the first known redshift and host of a short-hard GRB and shows that at least some short-hard GRBs are cosmological in origin. We began imaging the GRB field 8 minutes after the burst and continued for 8 days. We present a reanalysis of the XRT afterglow and report the absolute position of the GRB. Based on positional coincidences, the GRB and the elliptical are likely to be physically related, unlike any known connection between a long-duration GRB and an early-type galaxy. Similarly unique, GRB 050509b likely also originated from within a rich cluster of galaxies with detectable diffuse X-ray emission. We demonstrate that while the burst was underluminous, the ratio of the blast wave energy to the γ-ray energy is consistent with that of long-duration GRBs. Based on this analysis, on the location of the GRB (40 ± 13 kpc from the putative host), on the galaxy type (elliptical), and the lack of a coincident supernova, we suggest that there is now observational support for the hypothesis that short-hard bursts arise during the merger of a compact binary. We limit the properties of any Li-Paczyński "minisupernova" that is predicted to arise on ~1 day timescales. Other progenitor models are still viable, and new Swift bursts will undoubtedly help to further clarify the progenitor picture.