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Long gamma-ray bursts (LGRBs) are associated with the death of massive stars.Their host galaxies therefore represent a unique class of objects tracing starformation across the observable Universe. Indeed, recently accumulated evidenceshows that GRB hosts do not differ substantially from general population ofgalaxies at high (z > 2) redshifts. However, it has been long recognised thatthe properties of z < 1.5 hosts, compared to general star-forming population,are unusual. To better understand the reasons for the supposed difference inLGRB hosts properties at z < 1.5, we obtained VLT/X- Shooter spectra of sixhosts lying in the redshift range of 0.8 < z < 1.3. Some of these hosts havebeen observed before, yet we still lack well constrained information on theircharacteristics such as metallicity, dust extinction and star formation rate.We search for emission lines in the VLT/X-Shooter spectra of the hosts andmeasure their fluxes. We perform a detailed analysis, estimating host averageextinction, star-formation rates, metallicities and electron densities wherepossible. Measured quantities of our hosts are compared to a larger sample ofpreviously observed GRB hosts at z < 2. Star-formation rates and metallicitiesare measured for all the hosts analyzed in this paper and metallicities arewell determined for 4 hosts. The mass-metallicity relation, the fundamentalmetallicity relation and SFRs derived from our hosts occupy similar parameterspace as other host galaxies investigated so-far at the same redshift. Wetherefore conclude that GRB hosts in our sample support the found discrepancybetween the properties of low-redshift GRB hosts and the general population ofstar- forming galaxies.

GRB host galaxies with VLT/X-Shooter: properties at 0.8 < z < 1.3