Description
We estimate a gamma-ray burst (GRB) formation rate based on the new relation between the spectral peak energy (E_p_) and the peak luminosity. The new relation is derived by combining the data of E_p_ and the peak luminosities by BeppoSAX and BATSE, and it looks considerably tighter and more reliable than the relations suggested by the previous works. Using the new E_p_-luminosity relation, we estimate redshifts of the 689 GRBs without known distances in the BATSE catalog and derive a GRB formation rate as a function of the redshift.
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