Filter transmission curves are availableĀ from here.
Here, the filter transmission curve include the effects of QE of CCD, dewar window, transmittance of the Primary Focus Unit of HSC, Vignetting, Reflectivity of the Primary Mirror of Subaru telescope, and atmospheric absorption at Mauna Kea.
(see https://subarutelescope.org//Observing/Instruments/HSC/sensitivity.html for more details.)