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Structured Jets and X-ray Plateaus in Gamma-Ray Burst Phenomena

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arxiv 1904.08786 v2 pith:IOZ56UCP submitted 2019-04-18 astro-ph.HE

Gor Oganesyan , Stefano Ascenzi , Marica Branchesi , Om Sharan Salafia , Simone Dall'Osso , Giancarlo Ghirlanda This is my paper
classification astro-ph.HE
keywords x-raylightstructuredcurvesexplainburstemissiongamma-ray
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The first multi-messenger detection of a binary neutron star merger, GW170817, brought to the forefront the structured jet model as a way to explain multi-wavelength observations taken more than a year after the event. Here we show that the high-latitude emission from a structured jet can naturally produce an X-ray plateau in gamma-ray burst (GRB) light curves, independent of the radiation from an external shock. We calculate the radiation from a switched-off shell featuring an angular structure in both its relativistic bulk motion and intrinsic brightness. Our model is able to explain the shallow decay phase (plateau) often observed in GRB X-ray light curves. We discuss the possible contribution of the structured jet high-latitude emission to other distinctive features of GRB X-ray light curves, and its capability to explain the chromatic optical/X-ray light curve properties.

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