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Fig. 2.


Top panel: cosmic density rate of the three classes of high-energy transients considered: LGRB (yellow line), SGRB (green line), and SNe (orange lines). LGRB and SGRB rates are not corrected for the collimation angle, i.e., they represent the fraction of bursts whose jets are pointed toward the Earth. The CSFR (blue line) is in units of M yr−1 Gpc−3. All the curves are normalized to their respective local rate (see Tables 1 and 2 for GRBs and SNe, respectively). Bottom panel: derivative of the formation rate curves shown in the top panel. The color-coding is the same. The derivative of SNIbc, IIp coincides with that of the CSFR (blue line in the bottom panel). The horizontal line identifies for each curve the redshift z corresponding to the maximum of the rate curve.

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