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Title: Optical emission from GRB 050709: A short/hard GRB in a star-forming galaxy
Authors: Covino, S.
D'Avanzo, P.
Chincarini, G.
Fugazza, D.
Tagliaferri, G.
Campana, S.
Moretti, A.
Romano, P.
Zerbi, F. M.
Malesani, D.
Israel, G. L.
Antonelli, L. A.
Conciatore, M. L.
Fiore, F.
Guetta, D.
Stella, L.
D'Elia, V.
Melandri, A.
Piranomonte, S.
D'Avanzo, P.
Chincarini, G.
Delia Valle M
Hurley, K.
Lazzati, D.
Perna, R.
Vietri, M.
Burrows, D. N.
Nousek, J.
Filliatre, P.
Goldoni, P.
Filliatre, P.
Goldoni, P.
Gehrels, N.
Pellizza, L. J.
Melandri, A.
Mereghetti, S.
Mirabel, I. F.
O'Brien, P. T.
First Published: Feb-2006
Publisher: EDP Sciences for European Southern Observatory (ESO)
Citation: Astronomy & Astrophysics, 2006, 447 (2)
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 $z = 0.1606 \pm 0.0002$. 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 ($\sim $1 Gyr), and that ongoing star formation is present at a level of $2\mbox{--}3\,L/L_*~M_\odot$ 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.
DOI Link: 10.1051/0004-6361:200500228
ISSN: 0004-6361
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2006 ESO. Reproduced with permission from Astronomy & Astrophysics, © ESO.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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