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GRB 081029: A gamma-ray burst with a multi-component afterglow

Show simple item record Holland, S. T. et. al. Pandey, S. B. 2015-04-23T06:00:15Z 2015-04-23T06:00:15Z 2012
dc.description.abstract We present an analysis of the unusual optical light curve of the gamma-ray burst GRB 081029, a long–soft burst with a redshift of z = 3.8479.We combine X-ray and optical observations from the Swift X-Ray Telescope and the Swift UltraViolet/Optical Telescope with ground-based optical and infrared data obtained using the REM, ROTSE, and CTIO 1.3 m telescopes to construct a detailed data set extending from 86 s to ∼100000 s after the BAT trigger. Our data cover a wide energy range from 10 keV to 0.77 eV (1.24Å–16000 Å). The X-ray afterglow shows a shallow initial decay followed by a rapid decay starting at about 18000 s. The optical and infrared afterglow, however, shows an uncharacteristic rise at about 3000 s that does not correspond to any feature in the X-ray light curve. Our data are not consistent with synchrotron radiation from a jet interacting with an external medium, a two-component jet, or continuous energy injection from the central engine.We find that the optical light curves can be broadly explained by a collision between two ejecta shells within a two-component jet. A growing number of gamma-ray-burst afterglows are consistent with complex jets, which suggests that some (or all) gamma-ray-burst jets are complex and will require detailed modeling to fully understand them. en_US
dc.language.iso en_US en_US
dc.relation.ispartofseries apj745-41
dc.subject Gamma-ray burst: general – gamma-ray burst: individual: GRB 081029 en_US
dc.title GRB 081029: A gamma-ray burst with a multi-component afterglow en_US
dc.type Article en_US

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