@ARTICLE{2006Natur.441..463F,
   author = {{Fruchter}, A.~S. and {Levan}, A.~J. and {Strolger}, L. and 
	{Vreeswijk}, P.~M. and {Thorsett}, S.~E. and {Bersier}, D. and 
	{Burud}, I. and {Castro Cer{\'o}n}, J.~M. and {Castro-Tirado}, A.~J. and 
	{Conselice}, C. and {Dahlen}, T. and {Ferguson}, H.~C. and {Fynbo}, J.~P.~U. and 
	{Garnavich}, P.~M. and {Gibbons}, R.~A. and {Gorosabel}, J. and 
	{Gull}, T.~R. and {Hjorth}, J. and {Holland}, S.~T. and {Kouveliotou}, C. and 
	{Levay}, Z. and {Livio}, M. and {Metzger}, M.~R. and {Nugent}, P.~E. and 
	{Petro}, L. and {Pian}, E. and {Rhoads}, J.~E. and {Riess}, A.~G. and 
	{Sahu}, K.~C. and {Smette}, A. and {Tanvir}, N.~R. and {Wijers}, R.~A.~M.~J. and 
	{Woosley}, S.~E.},
    title = "{Long {$\gamma$}-ray bursts and core-collapse supernovae have different environments}",
  journal = {\nat},
     year = 2006,
    month = may,
   volume = 441,
    pages = {463-468},
      doi = {10.1038/nature04787},
   adsurl = {http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2006Natur.441..463F&db_key=AST},
  adsnote = {Provided by the Smithsonian/NASA Astrophysics Data System}
}