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We present Hubble Space Telescope (HST) observations of the exceptionallybright and luminous Swift gamma-ray burst, GRB 130427A. At z=0.34 this burstaffords an excellent opportunity to study the supernova and host galaxyassociated with an intrinsically extremely luminous burst ($E_{iso} >10^{54}$erg): more luminous than any previous GRB with a spectroscopically associatedsupernova. We use the combination of the image quality, UV capability and andinvariant PSF of HST to provide the best possible separation of the afterglow,host and supernova contributions to the observed light ~17 rest-frame daysafter the burst utilising a host subtraction spectrum obtained 1 year later.Advanced Camera for Surveys (ACS) grism observations show that the associatedsupernova, SN~2013cq, has an overall spectral shape and luminosity similar toSN 1998bw (with a photospheric velocity, v$_{ph}$ ~15,000 km/s). The positionsof the bluer features are better matched by the higher velocity SN~2010bh(v$_{ph}$ ~ 30,000 km/s), but SN 2010bh is significantly fainter, and fails toreproduce the overall spectral shape, perhaps indicative of velocity structurein the ejecta. We find that the burst originated ~4 kpc from the nucleus of amoderately star forming (1 Msol/yr), possibly interacting disc galaxy. Theabsolute magnitude, physical size and morphology of this galaxy, as well as thelocation of the GRB within it are also strikingly similar to those ofGRB980425/SN 1998bw. The similarity of supernovae and environment from both themost luminous and least luminous GRBs suggests broadly similar progenitor starscan create GRBs across six orders of magnitude in isotropic energy.

Hubble Space Telescope observations of the afterglow, supernova and host galaxy associated with the extremely bright GRB 130427A