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Exploiting the sample of 30 local star-forming, undisturbed late-typegalaxies in different environments drawn from the GAs Stripping Phenomena ingalaxies with MUSE (GASP), we investigate the spatially resolved Star FormationRate-Mass ({\Sigma}SFR-{\Sigma}_star) relation. Our analysis includes also thegalaxy outskirts (up to >4 effective radii, re), a regime poorly explored byother Integral Field Spectrograph surveys. Our observational strategy allows usto detect H{\alpha} out to more than 2.7re for 75% of the sample. Consideringall galaxies together, the correlation between the {\Sigma}SFR and{\Sigma}_star is quite broad, with a scatter of 0.3 dex. It gets steeper andshifts to higher {\Sigma}_star values when external spaxels are excluded andmoving from less to more massive galaxies. The broadness of the overallrelation suggests galaxy-by-galaxy variations. Indeed, each object ischaracterized by a distinct {\Sigma}SFR-{\Sigma}_star relation and in somecases the correlation is very loose. The scatter of the relation mainly arisesfrom the existence of bright off-center star-forming knots whose{\Sigma}SFR-{\Sigma}_star relation is systematically broader than that of thediffuse component. The {\Sigma}SFR-{\Sigma}tot gas (total gas surface density)relation is as broad as the {\Sigma}SFR-{\Sigma}_star relation, indicating thatthe surface gas density is not a primary driver of the relation. Even though alarge galaxy-by-galaxy variation exists, mean {\Sigma}SFR and {\Sigma}_starvalues vary of at most 0.7 dex across galaxies. We investigate the relationshipbetween the local and global SFR-M_star relation, finding that the latter isdriven by the existence of the size-mass relation.

GASP. XX. From the loose spatially-resolved to the tight global SFR-Mass relation in local spiral galaxies