On the Rates of Gamma-Ray Bursts and Type Ib/c Supernovae
On the Rates of Gamma-Ray Bursts and Type Ib/c Supernovae
We measure the local rates of "low-luminosity" gamma-ray bursts (LL GRBs; i.e., L ≲ 1049 ergs s-1) and "high-luminosity" gamma-ray bursts (HL GRBs). The values are in the range 0 = 100-1800 Gpc-3 yr-1 and 0 = 100-550 Gpc-3 yr-1, respectively, and their ratios to Type Ibc supernovae (SNe Ibc) …