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29 March 2024
 
  » arxiv » astro-ph/0605516

 Article overview


GRB 060121: Implications of a Short/Intermediate Duration Gamma-Ray Burst at High Redshift
A. de Ugarte Postigo ; A.J. Castro-Tirado ; S. Guziy ; J. Gorosabel ; G. Johannesson ; M.A. Aloy ; S.McBreen ; D.Q. Lamb ; N.Benitez ; M. Jelinek ; S.B. Pandey ; D. Coe ; M. D. Perez-Ramirez ; F.J. Aceituno ; M. Alises ; J.A. Acosta-Pulido ; G. Gomez ; R. Lopez ; T.Q. Donaghy ; Y.E. Nakagawa ; T. Sakamoto ; G.R. Ricker ; F.R. Hearty ; M. Bayliss ; G. Gyuk ; D.G. York ;
Date 19 May 2006
AbstractSince the discovery of the first short-hard gamma-ray burst afterglows in 2005, the handful of observed events have been found to be embedded in nearby (z < 1), bright underlying galaxies. We present multiwavelength observations of the short-duration burst GRB 060121, which is the first observed to clearly outshine its host galaxy (by a factor >10^2). A photometric redshift for this event places the progenitor at a most probable redshift of z = 4.6, with a less probable scenario of z = 1.7. In either case, GRB 060121 could be the farthermost short-duration GRB detected to date and implies an isotropic-equivalent energy release in gamma-rays comparable to that seen in long-duration bursts. We discuss the implications of the released energy on the nature of the progenitor. These results suggest that GRB 060121 may belong to a family of energetic short-duration events, lying at z > 1 and whose optical afterglows would outshine their host galaxies, unlike the first short-duration GRBs observed in 2005. The possibility of GRB 060121 being an intermediate duration burst is also discussed.
Source arXiv, astro-ph/0605516
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