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We present an analysis of the unusual optical light curve of the gamma-rayburst GRB 081029, a long-soft burst with a redshift of z = 3.8479. We combineX-ray and optical observations from the Swift X-Ray Telescope and the SwiftUltraViolet/Optical Telescope with ground-based optical and infrared dataobtained using the REM, ROTSE, and CTIO 1.3-m telescopes to construct adetailed data set extending from 86 s to approximately 100,000 s after the BATtrigger. Our data cover a wide energy range, from 10 keV to 0.77 eV (1.24 to16,000 Angstrom). The X-ray afterglow shows a shallow initial decay followed bya rapid decay starting at about 18,000 s. The optical and infrared afterglow,however, shows an uncharacteristic rise at about 3000 s that does notcorrespond to any feature in the X-ray light curve. Our data are not consistentwith synchrotron radiation from a jet interacting with an external medium, atwo-component jet, or continuous energy injection from the central engine. Wefind that the optical light curves can be broadly explained by a collisionbetween two ejecta shells within a two-component jet. A growing number ofgamma-ray burst afterglows are consistent with complex jets, which suggeststhat some (or all) gamma-ray burst jets are complex and will require detailedmodelling to fully understand them.

GRB 081029: A Gamma-Ray Burst with a Multi-Component Afterglow