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We present the results of a Hubble Space Telescope WFC3/F160W SNAPSHOT sur-vey of the host galaxies of 39 long-duration gamma-ray bursts (LGRBs) at z < 3.We have non-detections of hosts at the locations of 4 bursts. Sufficientaccuracy to as- trometrically align optical afterglow images and determine thelocation of the LGRB within its host was possible for 31/35 detected hosts. Inagreement with other work, we find the luminosity distribution of LGRB hosts issignificantly fainter than that of a star formation rate-weighted field galaxysample over the same redshift range, indicating LGRBs are not unbiasedlytracing the star formation rate. Morphologi- cally, the sample of LGRB hostsare dominated by spiral-like or irregular galaxies. We find evidence forevolution of the population of LGRB hosts towards lower-luminosity, higherconcentrated hosts at lower redshifts. Their half-light radii are consistentwith other LGRB host samples where measurements were made on rest-frame UVobser- vations. In agreement with recent work, we find their 80 per centenclosed flux radii distribution to be more extended than previously thought,making them intermedi- ate between core-collapse supernova (CCSN) andsuper-luminous supernova (SLSN) hosts. The galactocentric projected-offsetdistribution confirms LGRBs as centrally concentrated, much more so than CCSNeand similar to SLSNe. LGRBs are strongly biased towards the brighter regions intheir host light distributions, regardless of their offset. We find acorrelation between the luminosity of the LGRB explosion site and the intrinsiccolumn density, N_H , towards the burst.

The host galaxies and explosion sites of long-duration gamma ray bursts: Hubble Space Telescope near-infrared imaging