First data release of the Hyper Suprime-Cam Subaru Strategic Program
Authors: Aihara Hiroaki , Armstrong Robert , Bickerton Steven , Bosch James , Coupon Jean , Furusawa Hisanori , Hayashi Yusuke , Ikeda Hiroyuki , Kamata Yukiko , Karoji Hiroshi , Kawanomoto Satoshi , Koike Michitaro , Komiyama Yutaka , Lang Dustin , Lupton Robert H , Mineo Sogo , Miyatake Hironao , Miyazaki Satoshi , Morokuma Tomoki , Obuchi Yoshiyuki , Oishi Yukie , Okura Yuki , Price Paul A , Takata Tadafumi , Tanaka Manobu M , Tanaka Masayuki , Tanaka Yoko , Uchida Tomohisa , Uraguchi Fumihiro , Utsumi Yousuke , Wang Shiang-Yu , Yamada Yoshihiko , Yamanoi Hitomi , Yasuda Naoki , Arimoto Nobuo , Chiba Masashi , Finet Francois , Fujimori Hiroki , Fujimoto Seiji , Furusawa Junko , Goto Tomotsugu , Goulding Andy , Gunn James E , Harikane Yuichi , Hattori Takashi , Hayashi Masao , Hełminiak Krzysztof G , Higuchi Ryo , Hikage Chiaki , Ho Paul T P , Hsieh Bau-Ching , Huang Kuiyun , Huang Song , Imanishi Masatoshi , Iwata Ikuru , Jaelani Anton T , Jian Hung-Yu , Kashikawa Nobunari , Katayama Nobuhiko , Kojima Takashi , Konno Akira , Koshida Shintaro , Kusakabe Haruka , Leauthaud Alexie , Lee Chien-Hsiu , Lin Lihwai , Lin Yen-Ting , Mandelbaum Rachel , Matsuoka Yoshiki , Medezinski Elinor , Miyama Shoken , Momose Rieko , More Anupreeta , More Surhud , Mukae Shiro , Murata Ryoma , Murayama Hitoshi , Nagao Tohru , Nakata Fumiaki , Niida Mana , Niikura Hiroko , Nishizawa Atsushi J , Oguri Masamune , Okabe Nobuhiro , Ono Yoshiaki , Onodera Masato , Onoue Masafusa , Ouchi Masami , Pyo Tae-Soo , Shibuya Takatoshi , Shimasaku Kazuhiro , Simet Melanie , Speagle Joshua , Spergel David N , Strauss Michael A , Sugahara Yuma , Sugiyama Naoshi , Suto Yasushi , Suzuki Nao , Tait Philip J , Takada Masahiro , Terai Tsuyoshi , Toba Yoshiki , Turner Edwin L , Uchiyama Hisakazu , Umetsu Keiichi , Urata Yuji , Usuda Tomonori , Yeh Sherry , Yuma Suraphong 
Published: August 2017

Abstract
The Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) is a three-layered imaging survey aimed at addressing some of the most important outstanding questions in astronomy today, including the nature of dark matter and dark energy. The survey has been awarded 300 nights of observing time at the Subaru Telescope, and it started in 2014 March. This paper presents the first public data release of HSC-SSP. This release includes data taken in the first 1.7 yr of observations (61.5 nights), and each of the Wide, Deep, and UltraDeep layers covers about 108, 26, and 4 square degrees down to depths of i ∼ 26.4, ∼26.5, and ∼27.0 mag, respectively (5 σ for point sources). All the layers are observed in five broad bands (grizy), and the Deep and UltraDeep layers are observed in narrow bands as well. We achieve an impressive image quality of 0${^{\prime\prime}_{.}}$6 in the i band in the Wide layer. We show that we achieve 1%–2% point spread function (PSF) photometry (root mean square) both internally and externally (against Pan-STARRS1), and ∼10 mas and 40 mas internal and external astrometric accuracy, respectively. Both the calibrated images and catalogs are made available to the community through dedicated user interfaces and database servers. In addition to the pipeline products, we also provide value-added products such as photometric redshifts and a collection of public spectroscopic redshifts. Detailed descriptions of all the data can be found online. The data release website is https://hsc-release.mtk.nao.ac.jp.