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We present new estimate of the LGRB event rate in the local Universe. Adopting a Monte Carlo approach and assuming a Log-normal distributed emitted energy of the population of LGRBs, we derive a mock catalogue of simulated fluences for the five Swift energy bands. We than compare its corresponding distribution with the observed one by mean of best fit procedure. This gives a mean jet energy of logEγ = 49.48 (in erg), where the observed redshift distribution is only well constrained after a moderate, linear evolution of the mean energy with redshift is been considered. Finally, we deduce the local formation rate to be RGRB = 290 Gpc3yr1 representing less than 9% of the local formation rate of type Ib/c supernovae. The present results suggest that GRB progenitors, if following the cosmic star formation history, are very massive and potentially highly rotating stars.

LGRBs beaming features and SNIb/c connection in the light of the Second Swift BAT Catalog