The early optical afterglow and non-thermal components of GRB 060218
Date
2019Author
Kuin, N. P. M.
DE PASQUALE, Massımılıano
Breeveld, A. A.
Brown, P. J.
Oates, S. R.
Emery, S. W. K.
Page, M. J.
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We re-examine the UV/optical and X-ray observations of GRB 060218 during the prompt and afterglow phases. We present evidence in the UV/optical spectra that there is a synchrotron component contributing to the observed flux in the initial 1350 s. This result suggests that GRB 060218 is produced from a low-luminosity jet, which penetrates through its progenitor envelope after core collapse. The jet interacts with the surrounding medium to generate the UV/optical external shock synchrotron emission. After 1350 s, the thermal radiation in the UV/optical and X-ray becomes the dominant contribution to the observed flux. The UV/optical and X-ray spectra at 1350-10 000 s can be fitted with a spherically outflowing blackbody model, with an additional power-law component to the model at X-ray energies.
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