WISE Software Interface Specification; fpg01; (WSDC D-I124) Written by F. Masci, version 1.0, 03/24/2009 Interface Name: Proposed FITS metadata for single frame image products (level-1b frames): intensity, uncertainty, and mask frames. Read By: ARCHIVE TOOLS _________________________________ who? (Cognizant Scientist: Lin Yan) Written By: Final Product Generator (FPG) _________________ who? DESCRIPTION: Level-1b frames are FITS images of single-band exposures that have been instrumentally and astrometrically calibrated. These will be stored in the IRSA-WSDC Archive for distribution to the public. For details, see document WSDC D-D007. There are three associated single frame products per band. These are as follows, with generic filenames as generated in WSDS processing: -w-int-1b.fits - main intensity frame -w-unc-1b.fits - corresponding uncertainty frame storing 1-sigma values for each pixel -w-msk-1b.fits - corresponding bit mask indicating 'bad' pixels and processing status for each pixel. For details, see specifications document: WSDC D-I101 GENERIC FITS HEADER: Below is the proposed FITS metadata to write to each frame header. Keyword values are not realistic. The "int", "unc" and "msk" product types are distinguished by the FILETYPE keyword, e.g: int: FILETYPE = 'intensity image frame' unc: FILETYPE = '1-sigma uncertainty image frame' msk: FILETYPE = 'processing bit mask' See below for further notes on specific keywords. SIMPLE = T / file does conform to FITS standard BITPIX = -32 / number of bits per data pixel NAXIS = 2 / number of data axes NAXIS1 = 1016 / length of data axis 1 NAXIS2 = 1016 / length of data axis 2 / IDENTIFICATION AND TIME INFORMATION FILETYPE= 'intensity image frame' / product description VERSION = X.X / processing version release TELESCOP= 'WISE' / telescope used to acquire data BAND = 1 / wavelength band FRAMEID = 'xxxxxxxxx' / frame identifier SCAN = '40005b ' / scan identifier SCANGRP = '5b ' / scan group identifier FCREATE = '2008-10-14T11:19:03' / WSDC file creation date DATE_OBS= '2009-12-10T16:18:03' / date/time at mid-exposure SCLK_OBS= 1260807543 / [sec] time since 1/1/1980 at mid-exposure MJD_OBS = 55179.674455 / [days] MJD at mid-exposure (JD-2400000.05) UTCS_OBS= 1260807543 / [sec] J2000 ephem. time at mid-exposure UTC = '2009-348T16:19:03.00' / date/time corresponding to UTCS_OBS EXPTIME = 8.8 / [sec] frame exposure time / PHOTOMETRY INFORMATION BUNIT = 'DN' / image pixel units MAGZP = 20.7712 / [mag] relative photometric zero point MAGZPUNC= 0.0213 / [mag] 1-sigma uncertainty in zero point GAIN = 3.827 / [e-/DN] effective DEB gain / RAW POINTING EQUINOX = 2000.0 / [year] equinox of WCS EPOCH = 2010.1234567 / [year] obs. epoch derived from MJD_OBS RA0 = 346.62027 / [deg] raw RA at frame center for EQUINOX DEC0 = 24.723413 / [deg] raw Dec at frame center for EQUINOX ELON0 = 358.283464375023 / [deg] ecliptic longitude at frame center ELAT0 = 27.861506700888 / [deg] ecliptic latitude at frame center GLON0 = 94.5642062217685 / [deg] galactic longitude at frame center GLAT0 = -32.3030368943585 / [deg] galactic latitude at frame center / RECONSTRUCTED POINTING AND WCS CRVAL1 = 346.620274 / [deg] RA at CRPIX1,CRPIX2 for EQUINOX CRVAL2 = 24.723413 / [deg] Dec at CRPIX1,CRPIX2 for EQUINOX PA = 64.0392768545668 / [deg] pos.angle of +axis2 E of N for EQNOX WCROTA2 = 295.960723145433 / [deg] image twist: +axis2 W of N for EQNOX WCDELT1 = -0.000763212454038847 / [deg/pix] scale at CRPIX1,CRPIX2 for axis 1 WCDELT2 = 0.000763212454038847 / [deg/pix] scale at CRPIX1,CRPIX2 for axis 2 PXSCAL1 = 2.74756483453985 / [asec/pix] scale at CRPIX1,CRPIX2 for axis1 PXSCAL2 = 2.74756483453985 / [asec/pix] scale at CRPIX1,CRPIX2 for axis2 CRPIX1 = 508.5 / ref. pixel at CRVAL1,CRVAL2 along axis 1 CRPIX2 = 508.5 / ref. pixel at CRVAL1,CRVAL2 along axis 2 CTYPE1 = 'RA---SIN-SIP' / projection type [w\ distortion] for axis 1 CTYPE2 = 'DEC--SIN-SIP' / projection type [w\ distortion] for axis 2 CD1_1 = -0.0003341 / [deg/pix] CD matrix element 1_1 CD1_2 = 0.0006862 / [deg/pix] CD matrix element 1_2 CD2_1 = 0.0006862 / [deg/pix] CD matrix element 2_1 CD2_2 = 0.0003341 / [deg/pix] CD matrix element 2_2 CRDER1 = 0.017 / [deg] Uncertainty in CRVAL1 CRDER2 = 0.017 / [deg] Uncertainty in CRVAL1 CSDRADEC= 0 / [deg] Costandard deviation in RA and Dec UNCRTPA = 0.017 / [deg] Uncertainty in position angle UNCRTS1 = 3.0E-06 / [deg] Uncertainty in pix. scale for axis 1 UNCRTS2 = 3.0E-06 / [deg] Uncertainty in pix. scale for axis 1 / DISTORTION KEYWORDS A_ORDER = 3 / polynomial order, axis 1, detector to sky A_0_2 = -6.341484E-05 / axis 1 distortion coefficient of v^2 A_0_3 = -1.458834E-08 / axis 1 distortion coefficient of v^3 A_1_1 = 2.204371E-04 / axis 1 distortion coefficient of u.v A_1_2 = 1.025434E-07 / axis 1 distortion coefficient of u.v^2 A_2_0 = -1.001876E-04 / axis 1 distortion coefficient of u^2 A_2_1 = -2.062207E-09 / axis 1 distortion coefficient of u^2.v A_3_0 = 8.086817E-08 / axis 1 distortion coefficient of u^3 A_DMAX = 1.625876 / [pixel] maximum correction B_ORDER = 3 / polynomial order, axis 2, detector to sky B_0_2 = 2.511898E-04 / axis 2 distortion coefficient of v^2 B_0_3 = 6.642542E-08 / axis 2 distortion coefficient of v^3 B_1_1 = -2.703651E-05 / axis 2 distortion coefficient of u.v B_1_2 = 5.469226E-08 / axis 2 distortion coefficient of u.v^2 B_2_0 = 3.103393E-05 / axis 2 distortion coefficient of u^2 B_2_1 = 4.404894E-08 / axis 2 distortion coefficient of u^2.v B_3_0 = 3.954436E-08 / axis 2 distortion coefficient of u^3 B_DMAX = 1.271021 / [pixel] maximum correction AP_ORDER= 3 / polynomial order, axis 1, sky to detector AP_0_1 = 7.738011E-07 / axis 1 distortion coefficient of V AP_0_2 = 6.345607E-05 / axis 1 distortion coefficient of V^2 AP_0_3 = -3.144725E-08 / axis 1 distortion coefficient of V^3 AP_1_0 = -2.824433E-06 / axis 1 distortion coefficient of U AP_1_1 = -2.203247E-04 / axis 1 distortion coefficient of U.V AP_1_2 = 1.779848E-08 / axis 1 distortion coefficient of U.V^2 AP_2_0 = 1.000876E-04 / axis 1 distortion coefficient of U^2 AP_2_1 = -7.421441E-08 / axis 1 distortion coefficient of U^2.V AP_3_0 = -5.308015E-08 / axis 1 distortion coefficient of U^3 BP_ORDER= 3 / polynomial order, axis 2, sky to detector BP_0_1 = 9.438048E-07 / axis 2 distortion coefficient of V BP_0_2 = -2.510898E-04 / axis 2 distortion coefficient of V^2 BP_0_3 = 6.101012E-08 / axis 2 distortion coefficient of V^3 BP_1_0 = 2.048981E-06 / axis 2 distortion coefficient of U BP_1_1 = 2.735527E-05 / axis 2 distortion coefficient of U.V BP_1_2 = -8.480797E-08 / axis 2 distortion coefficient of U.V^2 BP_2_0 = -3.104517E-05 / axis 2 distortion coefficient of U^2 BP_2_1 = -1.130328E-08 / axis 2 distortion coefficient of U^2.V BP_3_0 = -4.741393E-08 / axis 2 distortion coefficient of U^3 SKEW = 0. / measure of non-orthogonality of frame axes / TELEMETRY DATA ??? TBD ??? DTANNEAL= 100 / [sec] time from last anneal UTANNEAL= 1260807543 / [sec] UTCS_OBS time of last anneal TEMP = 6.2 / [K] array temperature / QA INFORMATION (FOR INTENSITY DATA) ??? TBD ??? QASTATUS= 10 / Quality Assurance rating?? ??specific frame QA metrics?? END NOTES: * The above header pertains to either band 1, 2 or 3 where NAXIS1 = NAXIS2 = 1016. A band 4 frame will have NAXIS1 = NAXIS2 = 508. Other dependent keywords (e.g., WCS) will automatically reflect this. * Intensity (int) and uncertainty (unc) frames will have BITPIX = -32, corresponding to single precision (4-byte) floating point format. Mask (msk) images will have BITPIX = 32, corresponding to 4-byte integer format. * The BUNIT keyword for "int" and "unc" frames is always DN, and corresponds to a quantity proportional to the instrumentally calibrated slope returned by the WISE Digital Electronics Box (DEB). For "msk" frames, BUNIT should be set to 'dimensionless'.