Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-08-15
Nature 444:1050-1052,2006
Astronomy and Astrophysics
Astrophysics
14 pages, 4 color figures. Final version accepted to Nature. Title and author list updated. Includes supplementary material an
Scientific paper
10.1038/nature05374
Gamma-ray bursts (GRBs) are short, intense flashes of soft gamma-rays coming from the distant Universe. Long-duration GRBs (those lasting more than ~2 s) are believed to originate from the deaths of massive stars, mainly on the basis of a handful of solid associations between GRBs and supernovae. GRB 060614, one of the closest GRBs discovered, consisted of a 5-s hard spike followed by softer, brighter emission that lasted for ~100 s. Here we report deep optical observations of GRB 060614 showing no emerging supernova with absolute visual magnitude brighter than M_V = -13.7. Any supernova associated with GRB 060614 was therefore at least 100 times fainter, at optical wavelengths, than the other supernovae associated with GRBs. This demonstrates that some long-lasting GRBs can either be associated with a very faint supernova or produced by different phenomena.
Antonelli Lucio Angelo
Campana Sergio
Chincarini Guido
Covino Stefano
D'Avanzo Paolo
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