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\title{An Investigation on the GRB Peak Energy and Low-Energy Spectral Slope
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\author{\speaker{Hoi-Fung Yu}\\
        KTH Royal Institute of Technology
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        E-mail: \email{dy@kth.se
}}

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\abstract{
  There is no conclusive model for the emission mechanism for Gamma-Ray Bursts (GRBs). The conventional synchrotron emission models have been shown to present difficulties in explaining the hard low-energy spectral slopes (e.g., Preece et al. 1998) and the sharp peak curvature (e.g., Yu et al. 2015) in the observed time-resolved spectra. On the contrary, thermal emission from the photosphere (whether or not re-processed by sub-photospheric dissipation, which results in a broadened Planck function) provides a natural explanation for most of the narrow time-resolved spectra (e.g., Ryde 2004; Pe'er \&amp; Ryde 2011). The peak energy and low-energy spectral slope of some GRB spectra are shown to exhibit correlation (Burgess, Ryde, \&amp; Yu 2015). We investigate such behaviour by performing time-resolved spectral analysis using Bayesian techniques (Giacomo et al. 2015) and compare the results to various emission models including the thermal emission models.
}

\FullConference{7th Fermi Symposium 2017\\
		15-20 October 2017\\
		Garmisch-Partenkirchen, Germany}


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