The gamma-ray bursts and core-collapse supernovae - global star forming
  rate peaks at large redshifts
  This is a brief review on the first Gamma-Ray Bursts (GRB) optical
identifications - GRB host galaxies and Star Forming Rate (SFR) at relatively
small redshifts (z), on the metallicities of GRB hosts, the similarities and
differences between GRB hosts and galaxies at larger z, and on the SFR and GRB
rate (GRBR) at high z. Evidences of a direct connection between long-duration
GRBs and massive stars explosions (like Core-Collapse Super-Novae - CCSNe) are
presented. Is there a fast decrease in SFR up to z ~10? Some unsolved problems
related to GRBs are discussed: about the high-z GRB host galaxies, the high-z
CCSN-GRB connection, and possible new crucial cosmological tests at high z.
