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GRB 160709A is one of the few bright short gamma-ray bursts detected by boththe Gamma-ray Burst Monitor and the Large Area Telescope on board the $Fermi$$Gamma$-$ray$ $Space$ $Telescope$. The $\gamma$-ray prompt emission of GRB160709A is adequately fitted by combinations of three distinct components: (i)a nonthermal component described by a power law (PL) with a high-energyexponential cutoff, (ii) a thermal component modeled with a Planck function,and (iii) a second nonthermal component shaped by an additional PL crossing thewhole $\gamma$-ray spectrum. While the thermal component dominates during$\sim$ 0.12 s of the main emission episode of GRB 160709A with an unusuallyhigh temperature of $\sim$ 340 keV, the nonthermal components dominate in theearly and late time. The thermal component is consistent with the photosphericemission resulting in the following parameters: the size of the central engine,$R_{0}$ = $3.8 \substack{+5.9 \\ -1.8}$ $\times 10^{8}$ cm, the size of thephotosphere, R$_{ph}$ = $7.4 \substack{+0.8 \\ -1.2}$ $\times 10^{10}$ cm, anda bulk Lorentz factor, $\Gamma$ = $728 \substack{+75 \\ -93}$ assuming aredshift of 1. The slope of the additional PL spectrum stays unchangedthroughout the burst duration; however, its flux decreases continuously as afunction of time. A standard external shock model has been tested for theadditional PL component using the relation between the temporal and spectralindices (the closure relation). Each set of spectral and temporal indices fromtwo energy bands (200 keV--40 MeV and 100 MeV--10 GeV) satisfies a distinctclosure relation. From the closure relation test we derived the index for theelectron spectral distribution, $p$ = 2.5 $\pm$ 0.1. The interaction of the jetwith the interstellar environment is preferred over the interaction with thewind medium.

Multiple Components in the Broadband $\gamma$-ray Emission of the Short GRB 160709A