Can a double component outflow explain the X-ray and optical lightcurves of Swift Gamma-Ray Bursts?

Massimiliano De Pasquale, P. Evans, S. Oates, M. Page, S. Zane, P. Schady, A. Breeveld, S. Holland, M. Still

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Abstract

An increasing sample of Gamma-Ray Bursts (GRBs) observed by Swift show evidence of ‘chromatic breaks’, i.e. breaks that are present in the X-ray but not in the optical. We find that in a significant fraction of these GRB afterglows the X-ray and the optical emission cannot be produced by the same component. We propose that these afterglow lightcurves are the result of a two-component jet, in which both components undergo energy injection for the whole observation and the X-ray break is due to a jet break in the narrow outflow. Bursts with chromatic breaks also explain another surprising finding, the paucity of late achromatic breaks. We propose a model that may explain the behaviour of GRB emission in both X-ray and optical bands. This model can be a radical and noteworthy alternative to the current interpretation for the ‘canonical’ XRT and UVOT lightcurves, and it bears fundamental implications for GRB physics.
Original languageEnglish
Pages (from-to)1411-1414
Number of pages4
JournalAdvances in Space Research
Volume48
Issue number8
Early online date12 Jun 2011
DOIs
Publication statusPublished - 15 Oct 2011

Cite this

De Pasquale, M., Evans, P., Oates, S., Page, M., Zane, S., Schady, P., Breeveld, A., Holland, S., & Still, M. (2011). Can a double component outflow explain the X-ray and optical lightcurves of Swift Gamma-Ray Bursts? Advances in Space Research, 48(8), 1411-1414. https://doi.org/10.1016/j.asr.2011.06.006