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Title: A new gamma-ray burst classification scheme from GRB 060614.
Authors: Gehrels, N
Norris, JP
Barthelmy, SD
Granot, J
Kaneko, Y
Kouveliotou, C
Markwardt, CB
Mészáros, P
Nakar, E
Nousek, JA
O'Brien, PT
Page, M
Palmer, DM
Parsons, AM
Roming, PW
Sakamoto, T
Sarazin, CL
Schady, P
Stamatikos, M
Woosley, SE
First Published: 21-Dec-2006
Citation: NATURE, 2006, 444 (7122), pp. 1044-1046
Abstract: 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.
DOI Link: 10.1038/nature05376
eISSN: 1476-4687
Type: Journal Article
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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