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The Gemini Planet Imager (GPI) is a new facility instrument for the GeminiObservatory designed to provide direct detection and characterization ofplanets and debris disks around stars in the solar neighborhood. In addition toits extreme adaptive optics and corona graphic systems which give access tohigh angular resolution and high-contrast imaging capabilities, GPI contains anintegral field spectrograph providing low resolution spectroscopy across fivebands between 0.95 and 2.5 $\mu$m. This paper describes the sequence ofprocessing steps required for the spectro-photometric calibration of GPIscience data, and the necessary calibration files. Based on calibrationobservations of the white dwarf HD 8049B we estimate that the systematic errorin spectra extracted from GPI observations is less than 5%. The flux ratio ofthe occulted star and fiducial satellite spots within coronagraphic GPIobservations, required to estimate the magnitude difference between a targetand any resolved companions, was measured in the $H$-band to be $\Delta m =9.23\pm0.06$ in laboratory measurements and $\Delta m = 9.39\pm 0.11$ usingon-sky observations. Laboratory measurements for the $Y$, $J$, $K1$ and $K2$filters are also presented. The total throughput of GPI, Gemini South and theatmosphere of the Earth was also measured in each photometric passband, with atypical throughput in $H$-band of 18% in the non-coronagraphic mode, with somevariation observed over the six-month period for which observations wereavailable. We also report ongoing development and improvement of the data cubeextraction algorithm.

Gemini Planet Imager Observational Calibrations VI: Photometric and Spectroscopic Calibration for the Integral Field Spectrograph