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GEHRELS, N; NORRIS, J. P; O'BRIEN, P. T; PAGE, M; PALMER, D. M; PARSONS, A. M; ROMING, P. W. A; SAKAMOTO, T; SARAZIN, C. L; SCHADY, P; STAMATIKOS, M; WOOSLEY, S. E; BARTHELMY, S. D; GRANOT, J; KANEKO, Y; KOUVELIOTOU, C; MARKWARDT, C. B; MESZAROS, P; NAKAR, E; NOUSEK, J. A
Nature, 12/2006, Volume: 444, Issue: 7122Journal Article
Gamma-ray bursts (GRBs) are known to come in two duration classes, separated at approximately 2 s. Long-duration bursts originate from star-forming regions in galaxies, have accompanying supernovae when these are near enough to observe and are probably caused by massive-star collapsars. Recent observations show that short-duration bursts originate in regions within their host galaxies that have lower star-formation rates, consistent with binary neutron star or neutron star-black hole mergers. Moreover, although their hosts are predominantly nearby galaxies, no supernovae have been so far associated with short-duration GRBs. Here we report that the bright, nearby GRB 060614 does not fit into either class. Its approximately 102-s duration groups it with long-duration GRBs, while its temporal lag and peak luminosity fall entirely within the short-duration GRB subclass. Moreover, very deep optical observations exclude an accompanying supernova, similar to short-duration GRBs. This combination of a long-duration event without an accompanying supernova poses a challenge to both the collapsar and the merging-neutron-star interpretations and opens the door to a new GRB classification scheme that straddles both long- and short-duration bursts.
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