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|Title:||The shock break-out of GRB060218/SN2006aj|
Burrows, David N.
Della Valle, M.
Nousek, John A.
O'Brien, Paul T.
Osborne, Julian P.
Page, Kim L.
Kennea, Jamie A.
Barthelmy, Scott D.
Wells, Alan A.
|Citation:||Nature, 2006, 442, pp.1008-1010.|
|Abstract:||Although the link between long Gamma Ray Bursts (GRBs) and supernovae (SNe) has been established, hitherto there have been no observations of the beginning of a supernova explosion and its intimate link to a GRB. In particular, we do not know however how a GRB jet emerges from the star surface nor how a GRB progenitor explodes. Here we report on observations of the close GRB060218 and its connection to SN2006aj. In addition to the classical non-thermal emission, GRB060218 shows a thermal component in its X–ray spectrum, which cools and shifts into the optical/UV band as time passes. We interpret these features as arising from the break out of a shock driven by a mildly relativistic shell into the dense wind surrounding the progenitor. Our observations allow us for the first time to catch a SN in the act of exploding, to directly observe the shock break-out and to provide strong evidence that the GRB progenitor was a Wolf-Rayet star.|
|Description:||This is a preprint, as archived in arXiv.org, of the paper subsequently published as Nature, 2006, 442, pp.1008-1010 and available from http://www.nature.com/nature/journal/v442/n7106/full/nature04892.html|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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