The jet-powered supernovae of ∼10{sup 5}M{sub ⊙} population III stars are observable by EUCLID, WFIRST, WISH, and JWST

Supermassive black holes observed at high redshift z≳6 could grow from direct collapse black holes (DCBHs) with masses ∼10{sup 5}M{sub ⊙}, which result from the collapse of supermassive stars (SMSs). If a relativistic jet is launched from a DCBH, then it can break out of the collapsing SMS and produce a gamma-ray burst (GRB). Although most GRB jets are off-axis from our line of sight, we show that the energy injected from the jet into a cocoon is huge ∼10{sup 55−56} erg, so that the cocoon fireball is observed as an ultra-luminous supernova of ∼10{sup 45−46} erg s{sup −1} for ∼5000[(1+z)/16] days. They will be detectable by future telescopes with near-infrared bands, such as Euclid, WFIRST, WISH, and JWST up to z∼20 and ≲10 events per year, providing direct evidence of the DCBH scenario.