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We present high signal-to-noise ratio, precise $YJH$ photometry and $Y$ band(\gpiwave~$\mu$m) spectroscopy of HD 1160 B, a young substellar companiondiscovered from the Gemini NICI Planet Finding Campaign, using the SubaruCoronagraphic Extreme Adaptive Optics instrument and the Gemini Planet Imager.HD 1160 B has typical mid-M dwarf-like infrared colors and a spectral type ofM5.5$^{+1.0}_{-0.5}$, where the blue edge of our $Y$ band spectrum rules outearlier spectral types. Atmospheric modeling suggests HD 1160 B having aneffective temperature of 3000--3100 $K$, a surface gravity of log $g$ = 4--4.5,a radius of~\bestfitradius~$R_{\rm J}$, and a luminosity of log $L$/$L_{\odot}= -2.76 \pm 0.05$. Neither the primary's Hertzspring-Russell diagram positionnor atmospheric modeling of HD 1160 B show evidence for a sub-solarmetallicity. The interpretation of the HD 1160 B depends on which stellarsystem components are used to estimate an age. Considering HD 1160 A, B and Cjointly, we derive an age of 80--125 Myr, implying that HD 1160 B straddles thehydrogen-burning limit (70--90 $M_{\rm J}$). If we consider HD 1160 A alone,younger ages (20--125 Myr) and a brown dwarf-like mass (35--90 $M_{\rm J}$) arepossible. Interferometric measurements of the primary, a precise GAIA parallax,and moderate resolution spectroscopy can better constrain the system's age andhow HD 1160 B fits within the context of (sub)stellar evolution.

SCExAO and GPI $YJH$ Band Photometry and Integral Field Spectroscopy of the Young Brown Dwarf Companion to HD 1160