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Metal-poor massive stars may typically end up their lives as blue supergiants(BSGs). Gamma-ray bursts (GRBs) from such progenitors could have ultra-longduration of relativistic jets. For example Population III (Pop III) GRBs at z ~10-20 might be observable as X-ray rich events with a typical duration of T_90~ 10^4(1+z) sec. Recent GRB111209A at z = 0.677 has an ultra long duration ofT_90 ~ 2.5*10^4 sec so that it have been suggested that the progenitor might bea metal-poor BSGs in the local universe. Here, we suggest luminousUV/optical/infrared emissions associated with such a new class of GRB frommetal poor BSGs. Before the jet head breaks out the progenitor envelope, theenergy injected by the jet is stored in a hot-plasma cocoon, which finallyemerges and expands as a baryon-loaded fireball. We show that the photosphericemissions from the cocoon fireball could be intrinsically very bright (L_peak ~10^(42-44) erg/sec) in UV/optical bands (E_peak ~ 10 eV) with a typicalduration of ~ 100 days in the rest frame. Such cocoon emissions from Pop IIIGRB might be detectable in infrared bands at ~ years after Pop III GRBs at upto z ~ 15 by up-coming facilities like JWST. We also suggest that GRB111209Amight have been rebrightening in UV/optical bands up to an AB magnitude of <26. The cocoon emissions from local metal-poor BSGs might have been alreadyobserved as luminous supernovae without GRB since they can be seen from theoff-axis direction of the jet.

Luminous supernova-like UV/optical/infrared transients associated with ultra-long gamma-ray bursts from metal-poor blue supergiants