GRB071112C: A case study of different mechanisms in X-ray and optical temporal evolution

K. Y. Huang, Y. Urata, Y. H. Tung, H. M. Lin, L. P. Xin, M. Yoshida, W. Zheng, C. Akerlof, S. Y. Wang, W. H. Ip, M. J. Lehner, F. B. Bianco, N. Kawai, D. Kuroda, S. L. Marshall, M. E. Schwamb, Y. Qiu, J. H. Wang, C. Y. Wen, J. WeiK. Yanagisawa, Z. W. Zhang

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10 Scopus citations


We present a study on GRB071112C X-ray and optical light curves. In these two wavelength ranges, we have found different temporal properties. The R-band light curve showed an initial rise followed by a single power-law decay, while the X-ray light curve was described by a single power-law decay plus a flare-like feature. Our analysis shows that the observed temporal evolution cannot be described by the external shock model in which the X-ray and optical emission are produced by the same emission mechanism. No significant color changes in multi-band light curves and a reasonable value of the initial Lorentz factor (Γ0 = 275 ± 20) in a uniform interstellar medium support the afterglow onset scenario as the correct interpretation for the early R band rise. The result suggests that the optical flux is dominated by afterglow. Our further investigations show that the X-ray flux could be created by an additional feature related to energy injection and X-ray afterglow. Different theoretical interpretations indicate the additional feature in X-ray can be explained by either late internal dissipation or local inverse-Compton scattering in the external shock.

Original languageEnglish
Article number44
JournalAstrophysical Journal
Issue number1
StatePublished - 20 Mar 2012


  • gamma-ray burst: individual (GRB 071112C)


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