Gamma-ray bursts (GRBs) are short, intense flashes of soft γ-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 (refs 8, 9). Here we report deep optical observations of GRB 060614 showing no emerging supernova with absolute visual magnitude brighter than MV = -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.
An enigmatic long-lasting γ-ray burst not accompanied by a bright supernova
M. Valle,G. Chincarini,G. Chincarini,N. Panagia,G. Tagliaferri,D. Malesani,V. Testa,D. Fugazza,D. Fugazza,S. Campana,S. Covino,V. Mangano,L. A. Antonelli,P. D’Avanzo,K. Hurley,I. Mirabel,L. Pellizza,S. Piranomonte,L. Stella
Published 2006 in Nature
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2006
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Nature
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2006-08-15
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Physics
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