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Neutral hydrogen represents the major observable baryonic constituent ofgalaxies that fuels the formation of stars through the transformation inmolecular hydrogen. The emission of the hydrogen recombination line Halpha isthe most direct tracer of the process that transforms gas (fuel) into stars. Wecontinue to present Halpha3 (acronym for Halpha-alpha-alpha), an extensiveHalpha+[NII] narrow-band imaging campaign of galaxies selected from the HIArecibo Legacy Fast ALFA Survey (ALFALFA), using the instrumentation availableat the San Pedro Martir observatory (Mexico). In only four years since 2011 wewere able to complete in 48 nights the Halpha imaging observations of 724galaxies in the region of the Coma supercluster 10^h < R.A. <16^h; 24^o < Dec.<28^o and 3900<cz<9000 kms^{-1}. Of these, 603 are selected from the HI AreciboLegacy Fast ALFA Survey (ALFALFA) and constitute a 97% complete sample. Theyprovide for the first time a complete census of the massive star formationproperties of local gas-rich galaxies belonging to different environments(cluster vs filaments), morphological type (spirals vs dwarf Irr), over a widerange of stellar mass (10^{8}-10^{11.5} Modot) in the Coma Supercluster. Thepresent Paper V provides the Halpha data and the derived star formation ratesfor the observed galaxies.

Halpha3: an Halpha imaging survey of HI selected galaxies from ALFALFA. V: The Coma Supercluster survey completion