creator_did          = ivo://SNU/P/KS4/DR1/I
hips_creator         = SNU (Seo-Won Chang)
hips_copyright       = (c) SNU
obs_title            = KS4 DR1 I
obs_collection       = KMTNet Synoptic Survey of Southern Sky - I band (Data Release 1)
obs_description      = The KMTNet Synoptic Survey of Southern Sky (KS4) is a survey designed to image the sky visible from the southern hemisphere using the Korea Microlensing Telescope Network (KMTNet), which consists of three identical 1.6-m telescopes in Chile (CTIO), South Africa (SAAO), and Australia (SSO), with special emphasis on the area of Dec < -60 where deep imaging data have been scarce. The primary scientific objective is to providing reference images for the identification of the optical counterparts of gravitational wave events and study kilonovae. The KS4 Data Release 1 (DR1) covers approximately 4,044 deg² of the southern sky using traditional Johnson-Cousins B, V, R, and I broadband filters. The data were collected between November 2019 and December 2023, reaching a 5-sigma depth of 22.1-22.8 mag. The release includes over 977 deep co-added images, photometric source catalogs for more than 230 million objects, and Hierarchical Progressive Survey data for interactive visualization.

obs_ack              =  This work was supported by the National Research Foundation of Korea (NRF) through grants No. 2020R1A2C3011091 and No. 2021M3F7A1084525, funded by the Ministry of Science and ICT (MSIT). It also received support from the Basic Science Research Program via the NRF, funded by the Ministry of Education (RS-2023-00245013). This research has made use of the KMTNet system operated by the Korea Astronomy and Space Science Institute (KASI) at three host sites of CTIO in Chile, SAAO in South Africa, and SSO in Australia. Data transfer from the host site to KASI was supported by the Korea Research Environment Open NETwork (KREONET).
prov_progenitor      = The original data were collected as part of the KMTNet Synoptic Survey of Southern Sky (KS4), using the Korea Microlensing Telescope Network (KMTNet) system operated by the Korea Astronomy and Space Science Institute (KASI).

# To be provided upon submission of the KS4 DR1 paper to JKAS in late August and subsequent publication.
#bib_reference       = 

# To be provided upon publication.
#bib_reference_url   = 

obs_copyright        = (c) SNU
obs_copyright_url    = https://astron.snu.ac.kr/en/

t_min                = 58816.8025
t_max                = 60299.1718

obs_regime           = Optical
em_min               = 7.2878e-7
em_max               = 8.7939e-7

client_category      = Image/Optical/KS4/DR1

hips_initial_ra      = 181.22104
hips_initial_dec     = -43.73164
hips_initial_fov     = 0.16

hips_builder         = Aladin/HipsGen v12.060
hips_version         = 1.4
hips_frame           = equatorial
hips_order           = 10
hips_order_min       = 0
hips_tile_width      = 512
#hips_service_url    = ex: http://yourHipsServer/KS4 DR1 I
hips_status          = public master clonableOnce

hips_pixel_scale     = 1.118E-4
s_pixel_scale        = 1.111E-4
dataproduct_type     = image
dataproduct_subtype  = live
hips_pixel_bitpix    = -32
data_pixel_bitpix    = -32
hips_sampling        = bilinear
hips_overlay         = overlayMean mergeOverwriteTile treeMean
hips_release_date    = 2025-05-15T01:03Z
hips_tile_format     = png fits
hips_pixel_cut       = 0.285 2331
hips_data_range      = -27827 81847
moc_sky_fraction     = 0.09802
hipsgen_date         = 2025-05-14T14:36Z
hipsgen_params       = -trim in=DR1_I out=KS4HiPS_I id=SNU/P/KS4/DR1/I maxthread=35 "pixelCut=0.285 2331 asinh" mode=overlayMean blank=0 order=10 incremental=true
hips_creation_date   = 2025-05-14T14:36Z
hips_estsize         = 3104091037
hips_nb_tiles        = 4547487
hips_check_code      = png:2102694049 fits:1211529230
hipsgen_date_1       = 2025-07-25T10:59Z
hipsgen_params_1     = in=http://qso.snu.ac.kr:8180/media/DR1/HiPS/KS4HiPS_I MIRROR