tokens: The Berger GRB group at Harvard is supported in part by the NSF under grant AST-1411763 and by NASA under grant NNX15AE50G. This paper is based upon work supported by the National Science Foundation Graduate Research Fellowship Program under Grant No. DGE1144152. W.F. acknowledges support provided by NASA through Einstein Postdoctoral Fellowship grant number PF4-150121 issued by the Chandra X-ray Observatory Center, which is operated by the Smithsonian Astrophysical Observatory for NASA under contract NAS8-03060. We thank Ragnhild Lunnan, Maria Drout, Josh Grindlay, and Avi Loeb for helpful discussions. The HST data presented here and the Swift /UVOT data used in this work were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non- HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts. Based in part on observations obtained at the Gemini Observatory, acquired through the Gemini Science Archive, and processed using the Gemini IRAF package, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnologia e Innovación Productiva (Argentina). Based in part on data obtained from the ESO Science Archive Facility. This paper makes use of data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. This research has made use of data obtained from the Chandra Data Archive and software provided by the Chandra X-ray Center (CXC) in the application package CIAO. Based in part on data collected at the Subaru Telescope and obtained from SMOKA, which is operated by the Astronomy Data Center, National Astronomical Observatory of Japan. We thank S.B. Cenko for providing Palomar 60 inch afterglow images for GRBs 060206 and 090618, T. Krühler and J. Greiner for providing GROND afterglow images for GRBs 080520, 081121, and 081109 and a WHT image for GRB 090113, D. Malesani for providing a TNG afterglow image for GRB 060605, D. A. Kann for providing a WHT afterglow image for GRB 060124, and D. Perley for providing a Keck telescope afterglow image of GRB 071010A and a Palomar 60 inch afterglow image of GRB 080607.
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