Hyper Suprime-Cam Legacy Archive
  We present the launch of the Hyper Suprime-Cam Legacy Archive (HSCLA), a
public archive of processed, science-ready data from Hyper Suprime-Cam (HSC).
HSC is an optical wide-field imager installed at the prime focus of the Subaru
Telescope and has been in operation since 2014. While ~1/3 of the total
observing time of HSC has been used for the Subaru Strategic Program (SSP), the
remainder of the time is used for PI programs. We have processed the data from
these PI programs and make the processed, high quality data available to the
community through HSCLA. The current version of HSCLA includes data taken in
the first year of science operation, 2014. We provide both individual and coadd
images as well as photometric catalogs. The photometric catalog from the coadd
is loaded to the database, which offers a fast access to the large catalog.
There are other online tools such as image browser and image cutout tool and
they will be useful for science analyses. The coadd images reach 24-27th
magnitudes at $5\sigma$ for point sources and cover approximately 580 square
degrees in at least one filter with 150 million objects in total. We perform
extensive quality assurance tests and verify the photometric and astrometric
quality of the data to be good enough for most scientific explorations.
However, the data are not without problems and users are referred to the list
of known issues before exploiting the data for science. All the data and
documentations can be found at the data release site,
https://hscla.mtk.nao.ac.jp/.
