Physical conditions and element abundances in SN and GRB host galaxies
  at different redshifts
  We compare the physical parameters and the relative abundances calculated
throughout supernova (SN) and gamma-ray burst (GRB) host galaxies by the
detailed modelling of the spectra. The results show that : 1) shock velocities
are lower in long period GRB (LGRB) than in SN host galaxies. 2) O/H relative
abundance in SN hosts are scattered within a range 8.0 <12+log(O/H)<8.85 but
they are close to solar in LGRB hosts. N/H are lower than solar for both SN and
LGRB. 3) The starburst temperatures within a few SN hosts reach Ts >10^5 K. Ts
in LGRB hosts are 3-8 10^4 K. 4) Ha increases with the ionization parameter U.
We suggest that SN-host symbiosis is stronger in terms of host galaxy activity
than GRB-host in the range of energies related to the near UV - optical - near
IR spectra.
