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We have modelled the line ratios and the continuum spectral energydistribution (SED) of the short gamma-ray burst GRB100628A host galaxy complex.The results suggest that an active galactic nucleus (AGN) and a star-burst (SB)coexist in Nicuesa Guelbenzu et al.'s 'galaxy C'. The AGN spectrum is explainedby a relatively strong flux. Two of the observed regions (blobs) are located inthe ISM, outside the AGN photoionization cones. The strongest Hb line fluxcalculated by a SB dominated model was found in the tidal tail of galaxy C,while the strongest Hb line flux calculated by an AGN dominated model was foundin the galaxy C bulk. O/H element abundances are near solar everywhere, whileN/H spans a factor of ~10. The radio data have different origins, thermalbremsstrahlung and reprocessed radiation by dust. The infrared-opticalphotometric data measured from Nicuesa Guelbenzu et al.'s 'galaxy D', locatedoutside the X-ray telescope (XRT) error circle, are reproduced by a black-bodyflux at 3000 K. This flux may represent the radiation of the underlying oldstar population observed throughout the SED in the infrared. AGNs in other SGRBhosts are investigated.

AGN and starburst coexistence in the short GRB100628A host galaxy