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On the nature of nearby GRB/SN host galaxies

Sollerman, J.; Östlin, G.; Fynbo, J. P. U. +3 more

We present and discuss optical diagnostics of the low redshift ( z < 0.2) galaxies that are known to have hosted supernovae associated with γ-ray bursts (GRBs). The three galaxies are all actively star forming sub-luminous ( L < L^⋆) galaxies with relatively low metallicities ( Z ≲ Z_⊙). We find no evidence for substantia…