Optical emission from GRB 050709: A short/hard GRB in a star-forming galaxy

S. Covino, D. Malesani, G. L. Israel, P. D'Avanzo, L. A. Antonelli, G. Chincarini, D. Fugazza, M. L. Conciatore, M. Delia Valle, F. Fiore, D. Guetta, K. Hurley, D. Lazzati, L. Stella, G. Tagliaferri, M. Vietri, S. Campana, D. N. Burrows, V. D'Elia, P. FilliatreN. Gehrels, P. Goldoni, A. Melandri, S. Mereghetti, I. F. Mirabel, A. Moretti, J. Nousek, P. T. O'Brien, L. J. Pellizza, R. Perna, S. Piranomonte, P. Romano, F. M. Zerbi

Research output: Contribution to journalArticlepeer-review

67 Scopus citations

Abstract

We present optical observations of the short/hard gamma-ray burst GRB 050709, the first such event with an identified optical counterpart. The object is coincident with a weak X-ray source and is located inside a galaxy at redshift z = 0.1606 ± 0.0002. Multiband photometry allowed us to study the broad-band spectral energy distribution. Late-time monitoring places strong limits on any supernova simultaneous with the GRB. The host galaxy is not of early type. Spectra show that the dominant stellar population is relatively young (∼1 Gyr), and that ongoing star formation is present at a level of 2-3 L/L* M⊙ yr-1. This is at least 2 orders of magnitude larger than that observed in the elliptical hosts of the short GRB 050509B and GRB 050724. This shows that at least some short GRBs originate in a young population. Short/hard GRB models based on the merger of a binary degenerate system are compatible with the host galaxy characteristics, although there is still the possibility of a connection between young stars and at least a fraction of such events.

Original languageEnglish (US)
Pages (from-to)L5-L8
JournalAstronomy and Astrophysics
Volume447
Issue number2
DOIs
StatePublished - Feb 2006

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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