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We present the study on GRB 071112C X-ray and optical light curves. In thesetwo wavelength ranges, we have found different temporal properties. The R-bandlight curve showed an initial rise followed by a single power-law decay, whilethe X-ray light curve was described by a single power-law decay plus aflare-like feature. Our analysis shows that the observed temporal evolutioncannot be described by the external shock model in which the X-ray and opticalemission are produced by the same emission mechanism. No significant colorchanges in multi-band light curves and a reasonable value of the initialLorentz factor ({\Gamma}0 = 275 \pm 20) in a uniform ISM support the afterglowonset scenario as the correct interpretation for the early R-band rise. Theresult suggests the optical flux is dominated by afterglow. Our furtherinvestigations show that the X-ray flux could be created by an additionalfeature related to energy injection and X-ray afterglow. Different theoreticalinterpretations indicate the additional feature in X-ray can be explained byeither late internal dissipation or local inverse-Compton scattering in theexternal shock.

The GRB 071112C: A Case Study of Different Mechanisms in X-ray and Optical Temporal Evolution