Gamma-Ray Bursts from Upscattered Self-absorbed Synchrotron Emission

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Abstract
We calculate the synchrotron self-Compton emission from internal shocks occurring in relativistic winds as a source of gamma-ray bursts, with allowance for self-absorption. For plausible model parameters, most pulses within a gamma-ray burst are optically thick to synchrotron self-absorption at the frequency at which most electrons radiate. Upscattering of photon number spectra harder than ν0 (such as the self-absorbed emission) yields inverse Compton photon number spectra that are flat; therefore, our model has the potential of explaining the low-energy indices harder than ν-2/3 (the optically thin synchrotron limit) that have been observed in some bursts. The optical counterparts of the model bursts are sufficiently bright to be detected by such experiments as the Livermore Optical Transient Imaging System, unless the magnetic field is well below equipartition.
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