This paper presents the second data release (DR2) of the Beijing-Arizona Sky Survey (BASS). BASS is an imaging survey of about 5400 deg2 in g and r bands using the 2.3 m Bok telescope. DR2 includes the observations as of July 2017 obtained by BASS and Mayall z-band Legacy Survey (MzLS). This is our first time to include the MzLS data covering the same area as BASS. BASS and MzLS have respectively completed about 72% and 76% of their observations. The two surveys will be served for the spectroscopic targeting of the upcoming Dark Energy Spectroscopic Instrument. Both BASS and MzLS data are reduced by the same pipeline. We have updated the basic data reduction and photometric methods in DR2. In particular, source detections are performed on stacked images, and photometric measurements are co-added from single-epoch images based on these sources. The median 5σ depths with corrections of the Galactic extinction are 24.05, 23.61, and 23.10 mag for g, r, and z bands, respectively. The DR2 data products include stacked images, co-added catalogs, and single-epoch images and catalogs. The BASS website (http://batc.bao.ac.cn/BASS/) provides detailed information and links to download the data.
@article{arxiv.1712.09165,
title = {The Second Data Release of the Beijing-Arizona Sky Survey},
author = {Hu Zou and Tianmeng Zhang and Zhimin Zhou and Xiyan Peng and Jundan Nie and Xu Zhou and Xiaohui Fan and Linhua Jiang and Ian McGreer and Arjun Dey and Dongwei Fan and Joseph R. Findlay and Jinhua Gao and Yizhou Gu and Yucheng Guo and Boliang He and Junjie Jin and Xu Kong and Dustin Lang and Fengjie Lei and Michael Lesser and Feng Li and Jun Ma and Xiaolei Meng and Moe Maxwell and Adam D. Myers and Liming Rui and David Schlegel and Fengwu Sun and Jiali Wang and Qirong Yuan},
journal= {arXiv preprint arXiv:1712.09165},
year = {2018}
}