  A new model grid containing 228,016 synthetic red supergiant explosions (Type
II supernovae) is introduced. Time evolution of spectral energy distributions
from 1 A to 50,000 A (100 frequency bins in a log scale) is computed at each
time step up to 500 days after explosion in each model. We provide light curves
for the filters of the Vera C. Rubin Observatory's Legacy Survey of Space and
Time (LSST), Zwicky Transient Facility (ZTF), Sloan Digital Sky Servey (SDSS),
and the Neil Gehrels Swift Observatory, but light curves for any photometric
filters can be constructed by convolving any filter response functions to the
synthetic spectral energy distributions. We also provide bolometric light
curves and photosphere information such as photospheric velocity evolution. The
parameter space covered by the model grid is five progenitor masses (10, 12,
14, 16, and 18 Msun at the zero-age main sequence, solar metallicity), ten
explosion energies (0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5, and 5.0 x
10^51 erg), nine 56Ni masses (0.001, 0.01, 0.02, 0.04, 0.06, 0.08, 0.1, 0.2,
and 0.3 Msun), nine mass-loss rates (1e-5.0, 1e-4.5, 1e-4.0, 1e-3.5, 1e-3.0,
1e-2.5, 1e-2.0, 1e-1.5, and 1e-1.0 Msun/yr with a wind velocity of 10 km/s),
six circumstellar matter radii (1, 2, 4, 6, 8, and 10 x 10^14 cm), and ten
circumstellar structures (beta = 0.5, 1.0, 1.5, 2.0, 2.5, 3.0, 3.5, 4.0, 4.5,
and 5.0). 56Ni is assumed to be uniformly mixed up to the half mass of a
hydrogen-rich envelope. This model grid can be a base for rapid
characterizations of Type II supernovae with sparse photometric sampling
expected in LSST through a Bayesian approach, for example. The model grid is
available at https://doi.org/10.5061/dryad.pnvx0k6sj.
