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GRB 060218/SN 2006aj: Prompt Emission from Inverse-Compton Scattering of Shock Breakout Thermal Photons

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arxiv astro-ph/0604510 v1 pith:AZH3RRKQ submitted 2006-04-24 astro-ph

Z. G. Dai , Bing Zhang , E. W. Liang This is my paper · ORCID
classification astro-ph
keywords emissionpromptthermaldatagamma-rayinverse-comptonluminosityoptical
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The gamma-ray burst (GRB) 060218/SN 2006aj is a peculiar event, with the second lowest redshift, low luminosity, long duration, chromatic lightcurve features, and in particular, the presence of a thermal component in the X-ray and UV-optical spectra. Thanks to detailed temporal and spectral coverage of the {\em Swift} observatory, the abundant data allow the GRB prompt emission to be modelled in great detail for the first time. The low flux of prompt UV/optical emission disfavors the conventional internal shock/synchrotron radiation models, which generally predict strong UV/optical emission. Here we show that the unusual prompt emission of GRB 060218 can be produced by inverse-Compton scattering of shock-accelerated relativistic electrons off the detected thermal photons. A pair of (forward plus reverse) shocks form when a relativistic outflow interacts with a preexisting slower shell. The observed gamma-ray emission and X-ray emission arise from the reverse-shocked and forward-shocked regions, respectively. A fit to the data requires an initially increasing outflow luminosity, which is consistent with the prediction of the popular collapsar model.

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  1. Revisiting GRB 060218: new insights into low-luminosity gamma-ray bursts from a revised shock breakout model

    astro-ph.HE 2024-12 conditional novelty 6.0 of 10

    An 'initially non-equilibrium rapid thermalization' (INERT) shock breakout model can simultaneously reproduce the X-ray light curve, spectral evolution, and early optical brightening of GRB 060218, implying a ~0.1 sol...

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