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

Дата и время публикации : 2011-11-28T15:59:13Z

Авторы публикации и институты :
Stephen T. Holland
Massimiliano De Pasquale
Jirong Mao
Takanori Sakamoto
Patricia Schady
Stefano Covino
Yi-Zhong Fan
Zhi Ping Jin
Paolo D’Avanzo
Angelo Antonelli
Valerio D’Elia
Guido Chincarini
Fabrizio Fiore
Shashi Bhushan Pandey
Bethany E. Cobb

Ссылка на журнал-издание: Ссылка на журнал-издание не найдена
Коментарии к cтатье: ApJ, in press; 29 pages, 8 figures
Первичная категория: astro-ph.HE

Все категории : astro-ph.HE

Краткий обзор статьи: 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 approximately 100,000 s after the BAT trigger. Our data cover a wide energy range, from 10 keV to 0.77 eV (1.24 to 16,000 Angstrom). The X-ray afterglow shows a shallow initial decay followed by a rapid decay starting at about 18,000 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 modelling to fully understand them.

Category: Physics