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We present a study on GRB 071112C 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.
Huang, K. Y.; Urata, Y.; Tung, Y. H.; Lin, H. M.; Xin, L. P.; Yoshida, M.; Zheng, W.; Akerlof, C.; Wang, S. Y.;
Ip, W. H.; Lehner, M. J.; Bianco, F. B.; Kawai, N.; Kuroda, D.; Marshall, S. L.; Schwamb, M. E.;
Qiu, Y.; Wang, J. H.; Wen, C. Y.; Wei, J.; Yanagisawa, K.;Zhang, Z. W.