ner_tags: O B-Organization I-Organization I-Organization O B-Organization O O O O O O B-Organization O O B-Grant O O B-Organization O O B-Grant O O O O O O O O O B-Organization I-Organization I-Organization B-Fellowship I-Fellowship I-Fellowship I-Fellowship O O O B-Fellowship O O B-Person I-Person O B-Person I-Person O O O O O O B-Telescope I-Telescope I-Telescope O O O B-Person I-Person O B-Person I-Person O O O O O O B-Telescope O O O O O O O O O O O O B-Observatory I-Observatory O O B-Organization I-Organization B-Organization I-Organization B-Organization I-Organization I-Organization B-Organization I-Organization O O B-Organization I-Organization I-Organization O O O O O O O O O O B-Grant I-Grant I-Grant I-Grant O B-Person B-Person O O O O O O B-Grant O O B-Organization O B-Grant I-Grant I-Grant I-Grant O O O O O B-Proposal O O O B-Observatory I-Observatory O O O B-Archive I-Archive I-Archive O O O O B-Software I-Software I-Software O O O O O B-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization O O O O O O B-Organization O O O O B-Observatory O O B-Organization I-Organization I-Organization B-Location I-Location O B-Organization I-Organization I-Organization B-Location B-Organization B-Location B-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization B-Location O B-Organization I-Organization I-Organization I-Organization I-Organization I-Organization B-Location O O O O O O O O B-Organization I-Organization I-Organization I-Organization O O O B-Observatory I-Observatory I-Observatory O O O O O O O O B-Observatory I-Observatory O O O O O B-Organization I-Organization O O B-Organization I-Organization I-Organization O O O O O O O B-Telescope I-Telescope I-Telescope I-Telescope O O B-Observatory I-Observatory I-Observatory B-Location O O O O O O B-Organization B-Telescope I-Telescope I-Telescope O O O O O O O O B-Organization I-Organization I-Organization I-Organization O O O B-Grant O O O B-Organization O O O O O B-Organization I-Organization I-Organization I-Organization O O O O O B-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization I-Organization O B-Organization O B-Grant I-Grant
tokens: The Berger Time-Domain Group at Harvard is supported in part by the NSF under grant AST-1714498 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. We thank Pete Challis and Allyson Bieryla for assistance with some of the FLWO 48 inch observations. We thank Stephen Smartt and Ken Smith for providing access to the early PSST images. This work is based in part on observations obtained at the MDM Observatory, operated by Dartmouth College, Columbia University, Ohio State University, Ohio University, and the University of Michigan. This work is partially based on data acquired with the Swift GO program 1114109 (PI Margutti). R.M. acknowledges partial support from programs No. NNX16AT51G provided by NASA through Swift Guest Investigator Programs. Based on observations (Proposal ID GN-2016B-FT-28) obtained at the Gemini Observatory acquired through the Gemini Observatory 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), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil). This paper uses data products produced by the OIR Telescope Data Center, supported by the Smithsonian Astrophysical Observatory. Some observations reported here were obtained at the MMT Observatory, a joint facility of the Smithsonian Institution and the University of Arizona. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile. Based on observations made with the NASA/ESA Hubble Space Telescope , obtained from the data archive at the Space Telescope Science Institute. Support for program GO-15162 was provided by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555.