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Type Ia supernovae (SNe Ia) have assumed a fundamental role as cosmologicaldistance indicators since the discovery of the accelerating expansion rate ofthe universe. Correlations between their optical peak luminosity, the declinerate of their light curves and their optical colours allow them to bestandardised, reducing their observed r.m.s scatter. Over a decade ago, theoptical peak luminosity of SNe Ia was found to correlate with host galaxystellar mass, further improving their standardisation. Since then, host galaxyproperties have been used in cosmological analyses of SNe Ia and tremendouseffort has gone into finding the property, such as star formation rate, thatfundamentally drives the correlation between SNe Ia and their host galaxies.Furthermore, it has been noted that the local environment in which theprogenitors of SNe Ia evolve is much better at reducing the scatter inestimated distances than the global environment, i.e., the whole galaxy.HostPhot is a tool that facilitates the calculation of both local and globalphotometry of galaxies hosting SNe Ia, therefore helping in the study of theenvironmental effect on these objects.

HostPhot: global and local photometry of galaxies hosting supernovae or other transients