# L1-IFS Data model ## 单次曝光处理_File：CSST_IFS_type_yyyymmddHHMMSS_yyyymmddHHMMSS_obsid_camera_L1_VER_process.fits ### File name description type:  目标类型，4位字符串,对于科学数据为‘SCIE’\ yyyymmdd: 八位数观测日期，如20240101\ HHMMSS:  六位数UT观测时间，如122838\ 两组时间为起始曝光时间和结束曝光时间\ obsid:  CSST统一的曝光编号，从相应0级数据继承\ camera:  光谱仪编号,1位字符串,红端为“R”,蓝端为“B”,红蓝拼接后的全谱为“A”\ L1:  表示文件为1级科学观测数据\ VER:  版本号，1位字符串和4位数字的组合,如R4203是DRP中RSS处理模块 v4.2.03 版本\ process:  8位字符串,代表8步基本数据处理流程，由字母表示,含义如下: ``` e：已抽谱 w：已进行波长定标 n：已对平场归一 r：已扣除宇宙线 f：已进行流量定标 c：已生成三维数据块 g: 已完成天体测量位置（IFS-WCS）定标 ``` ### File contents | HDU | data | note | |------|-------------------------|------------| | HDU0 | None | PrimaryHDU | | HDU1 | FLUX | ImageHDU | | HDU2 | IVAR | ImageHDU | | HDU3 | MASK | ImageHDU | ### HDU0 #### Header of `csst_ifs_rss` | Level 1 extension header keywords (new) | | | | |-----------------------------------------|---------------------------------------------------------------------|--------|----------------------------------------------------------------------------------------------------------| | Keyword | Description | Format | Remark | | Standard keywords | | | | | XTENSION | IMAGE extension | C8 | 'IMAGE ' | | BITPIX | Number of bits per data pixel | I4 | -32 | | NAXIS | Number of data axes | I4 | 3 | | NAXIS1 | Number of spatial bins in X axis | I4 | 32 | | NAXIS2 | Number of spatial bins in Y axis | I4 | 32 | | NAXIS3 | Number of wavelength bins | I4 | NWAVE | | Image processing keywords | | | | | PROCESS | RSS process record | C8 | ‘bewnrfcg’ | | RSS_VER | version of RSS code | C5 | | | FLUXUNIT | Flux unit | C20 | 1E-17 erg/s/cm2/Å/arcsec2 | | HISTORY | Time of last image processing | C80 | | | BIAS_MAS | The file name of the master bias. | C80 | | | DARK_MAS | The file name of the master dark | C80 | | | FLAT_MAS | The file name of the master flat | C80 | | | LAMP_MAS | The file name of the master lamp | C80 | | | TRACFILE | The reference file of trace | C80 | | | PTOWFILE | The reference file of pixel-to-wavelength solution | C80 | | | STDSTAR | The filename of the stardard star. | C80 | | | HASCTE | Has CTE correction | C01 | T or F | | HASSAT | Has satellite correction | C01 | T or F | | HASSCA | Has stray light correction | C01 | T or F | | QCFLUX | The counts of NAN+INF in flux | I4 | | | QCIV | The counts of NAN+INF in IV | I4 | | | | | | | | IFS-WCS Calibration keywords | | | | | WCSCAL_S | Determination of WCS calibration completion | I4 | The completion status is determined according to different situations, 0 means no operation is performed | | WCSCAL_V | Version of WCS calibration | Cxx | | | WCSCAL_P | Name of the configuration file used for WCS calibration | Cxx | | | WCS_TLM | Time of last wcs calibration | Cxx | Time of the last WCS calibration | | RADECSYS | Frame of reference of coordinates | C08 | 'ICRS' or 'FK5' | | EQUINOX | | R4 | always 2000.0 | | CD1_1 | Coordinate transformation matrix element | R8 | | | CD1_2 | Coordinate transformation matrix element | R8 | | | CD2_1 | Coordinate transformation matrix element | R8 | | | CD2_2 | Coordinate transformation matrix element | R8 | | | CTYPE1 | Right Ascension, gnomonic projection | C8 | 'RA---TAN' | | CTYPE2 | Declination, gnomonic projection | C8 | 'DEC--TAN' | | CUNIT1 | Units of coordinate increment and value | C4 | 'DEG' | | CUNIT2 | Units of coordinate increment and value | C4 | 'DEG' | | CRPIX1 | Pixel coordinate of reference point | R8 | | | CRPIX2 | Pixel coordinate of reference point | R8 | | | CRVAL1 | RA of reference point | R8 | deg | | CRVAL2 | DEC of reference point | R8 | deg | | CSYER1 | Systematic error in coordinate | R8 | deg | | CSYER2 | Systematic error in coordinate | R8 | deg | | CTYPE3 | The type of wavelength array | C8 | 'WAVE-LIN' or 'WAVE-LOG' | | CUNIT3 | unit of wavelength array | C8 | Angstrom | | CRPIX3 | Starting pixel | R8 | | | CRVAL3 | The central wavelength wv0 of first pixel | R8 | Angstrom | | CD3_3 | wavelength dispersion per pixel | R8 | Angstrom | | GGUIFILE | Geometric data object file of the guider camera relative to the IFS | Cxx | | | IGUIFILE | Image data object file for guider accompanying observations | Cxx | | | GMCIFILE | Geometric data object file of the MCI relative to the IFS | Cxx | | | IMCIFILE | Image data object file for MCI accompanying observations | Cxx | ## 多次曝光叠加_File: CSST_IFS_CUBE_{OBJ_id}_{VER_cube}_{LIN/LOG}_{STM_cube}.fits ### File contents | HDU | data | note | |------|-------------------------|------------| | HDU0 | None | PrimaryHDU | | HDU1 | FLUX | ImageHDU | | HDU2 | IVAR | ImageHDU | | HDU3 | MASK | ImageHDU | | HDU4 | EXP_NUM | ImageHDU | | HDU5 | LSF | ImageHDU | | HDU6 | WEIGHT_MARTIX | ImageHDU | | HDU7 | rRSS_FILE_LIST | BinTableHDU| ### HDU0 #### Header of `csst_ifs_cube` | keyword | value | comment | fill value | type | module | |-----------|:----------------------|---------------------------------------------------|--------------|------|--------------------------| | RSS_VER | R6100 | version of RSS code | RXXXX |str | csst_ifs_cube | | CUB_VER | C6100 | version of CUBE code | CXXXX |str | csst_ifs_cube | | COV_VER | C6100 | version of CUBE code | CXXXX |str | csst_ifs_cube | | LSF_VER | C6100 | version of CUBE code | CXXXX |str | csst_ifs_cube | | FLUXUNIT | '1E-17 erg/s/cm2/A/arcsec2' | unit of flux | '1E-17 erg/s/cm2/A/arcsec2'|str | csst_ifs_cube | | FLUXSCALE | 1 | Intensity unit scaling | 1 |I8 | csst_ifs_cube | | FLUXZERO | 0 | Intensity zeropoint | 0 |I8 | csst_ifs_cube | |TELESCOP | CSST | Telescope used to acquire data | CSST |str | csst_ifs_cube | |INSTRUMENT | IFS | Identifier for instrument used to acquire data | IFS |str | csst_ifs_cube | |OBJID | 174053.8-534326' | ID of Object(in the form of HHMMSS.S+DDMMSS) | hhmmss.sddmmss|str | csst_ifs_cube | |NEXP | 50 | number of science exposures combined | 0 |I8 | csst_ifs_cube | |EXPTIME | 60000 | Total exposure time | 0 |f32 | csst_ifs_cube | |MJDMIN | 2459955.2275463 | Minimum OBS MJD across all exposures | -9999 |f32 | csst_ifs_cube | |MJDMAX | 2459955.39282407 | Maximum OBS MJD across all exposures | -9999 |f32 | csst_ifs_cube | |MJDMED | 2459955.34074074 | Median OBS MJD across all exposures | -9999 |f32 | csst_ifs_cube | |WCSCAL_VER | A6101 | Version of WCS calibration | AXXX |str | csst_ifs_cube | |WCSCAL_P | | file for WCS calibration | "?" |str | csst_ifs_cube | |RADECSYS | FK5 | Frame of reference of coordinates | FK5 |str | csst_ifs_cube | |EQUINOX | 2000.0 | | 2000.0 |str | csst_ifs_cube | |OBJRA | 265.22407917 | Object R.A. (J2000 deg.) | -9999 |f32 | csst_ifs_cube | |OBJDEC | -53.72406389 | Object Dec. (J2000 deg.) | -9999 |f32 | csst_ifs_cube | |CENRA | 265.2240087483441 | Plate center R.A. (J2000 deg.) R4 | -9999 |f32 | csst_ifs_cube | |CENDEC | -53.72410555664603 | Plate center Dec. (J2000 deg.) R4 | -9999 |f32 | csst_ifs_cube | |CTYPE3 | 'LIN' | The type of wavelength array | 'LIN' |str | csst_ifs_cube | |CRPIX3 | 1.0 | Starting pixel | -9999 |f32 | csst_ifs_cube | |CRVAL3 | 3500.0 | The central wavelength wv0 of first pixel | -9999 |f32 | csst_ifs_cube | |CD3_3 | 1.75 | wavelength dispersion per pixel | -9999 |f32 | csst_ifs_cube | |CUNIT3 | 'Angstrom' | unit of wavelength | 'Angstrom' |str | csst_ifs_cube | |CRPIX1 | 49.0 | Reference pixel | -9999 |f32 | csst_ifs_cube | |CRPIX2 | 52.0 | Reference pixel | -9999 |f32 | csst_ifs_cube | |CRVAL1 | 265.22407917 | RA of reference point | -9999 |f32 | csst_ifs_cube | |CRVAL2 | -53.72406389 | Dec of reference point | -9999 |f32 | csst_ifs_cube | |CD1_1 | -2.7777777777777E-05 | Coordinate transformation matrix element | -9999 |f32 | csst_ifs_cube | |CD1_2 | 0.0 | Coordinate transformation matrix element | -9999 |f32 | csst_ifs_cube | |CD2_1 | 0.0 | Coordinate transformation matrix element | -9999 |f32 | csst_ifs_cube | |CD2_2 | 2.7777777777778E-05 | Coordinate transformation matrix element | -9999 |f32 | csst_ifs_cube | |CTYPE1 | 'RA---TAN' | Declination, gnomonic projection | 'RA---TAN' |str | csst_ifs_cube | |CTYPE2 | 'DEC--TAN' | Declination, gnomonic projection | 'DEC--TAN' |str | csst_ifs_cube | |CUNIT1 | 'deg' | Units of coordinate increment and value | 'deg' |str | csst_ifs_cube | |CUNIT2 | 'deg' | Units of coordinate increment and value | 'deg' |str | csst_ifs_cube | |EBVGAL | 0 | Galactic reddening E(B-V) | -9999 |f32 | csst_ifs_cube | |CHECKSUM | 0 |checksum | 1 |I8 | csst_ifs_cube |