The Copernicus FITS file headerSIMPLE = T / file does conform to FITS standard BITPIX = -32 / number of bits per data pixel NAXIS = 0 / number of data axes COMMENT FITS (Flexible Image Transport System) format defined in Astronomy and COMMENT Astrophysics Supplement Series v44/p363, v44/p371, v73/p359, v73/p365. COMMENT Contact the NASA Science Office of Standards and Technology for the COMMENT FITS Definition document #100 and other FITS information. ORIGIN = 'HEASARC/GSFC/NASA' / origin of FITS file DATE = '1999-05-11T12:20:59' / file creation date (YYYY-MM-DDThh:mm:ss UTC) TELESCOP= 'COPERNICUS' / Telescope (mission) name INSTRUME= 'UCLXE ' / Instrument name DATE-OBS= '02/02/74' / Start date of observation (dd/mm/yy) TIME-OBS= '07:03:28' / Start time of observation (hh:mm:ss) DATE-END= '02/02/74' / End date of observation (dd/mm/yy) TIME-END= '08:58:50' / End time of observation (hh:mm:ss) OBJECT = 'X PERSEI' / Original Copernicus source designation CATID1 = 'X PER ' / Source designation match, NONE if null IDHEADER= 'HEAD ' / Data Type COMMENT Catalog name : SIMBAD RA_OBJ = 5.80628500E+01 / Right Ascension from match, -999.0 if null DEC_OBJ = 3.09001870E+01 / Declination from match, -999.0 if null EQUINOX = 1950.0 / equinox of coordinate system RADECSYS= 'FK4 ' / Coordinate system CREATOR = 'copx2fits' / s/w task which wrote this dataset CHECKSUM= 'blj4ejg3bjg3bjg3' / HDU checksum updated 1999-05-11T12:20:59 DATASUM = ' 0' / data unit checksum updated 1999-05-11T12:20:59 END XTENSION= 'BINTABLE' / binary table extension BITPIX = 8 / 8-bit bytes NAXIS = 2 / 2-dimensional binary table NAXIS1 = 208 / width of table in bytes NAXIS2 = 53 / number of rows in table PCOUNT = 0 / size of special data area GCOUNT = 1 / one data group (required keyword) TFIELDS = 45 / number of fields in each row TTYPE1 = 'TIME ' / Seconds since MJDREF TFORM1 = 'D ' / data format of field: 8-byte DOUBLE TUNIT1 = 's ' / physical unit of field TTYPE2 = 'TDIFF ' / Time difference between rows TFORM2 = 'D ' / data format of field: 8-byte DOUBLE TUNIT2 = 's ' / physical unit of field TTYPE3 = 'HOURS ' / UT hours of the data frame TFORM3 = 'J ' / data format of field: 4-byte INTEGER TUNIT3 = 'h ' / physical unit of field TTYPE4 = 'MINUTES ' / UT minutes of the data frame TFORM4 = 'J ' / data format of field: 4-byte INTEGER TUNIT4 = 'min ' / physical unit of field TTYPE5 = 'SECONDS ' / UT seconds of the data frame TFORM5 = 'J ' / data format of field: 4-byte INTEGER TUNIT5 = 's ' / physical unit of field TTYPE6 = 'DAY ' / Day of the year of the data frame TFORM6 = 'J ' / data format of field: 4-byte INTEGER TUNIT6 = 'd ' / physical unit of field TTYPE7 = 'YEAR ' / Year of the data frame TFORM7 = 'J ' / data format of field: 4-byte INTEGER TUNIT7 = 'yr ' / physical unit of field TTYPE8 = 'ORBITADS' / Orbital address TFORM8 = 'J ' / data format of field: 4-byte INTEGER TTYPE9 = 'OBS_CNSTR' / Code the observational constraints TFORM9 = 'J ' / data format of field: 4-byte INTEGER TTYPE10 = 'TIME_ACPT' / Time counter for dead-time TFORM10 = 'J ' / data format of field: 4-byte INTEGER TTYPE11 = 'CNT_1_3 ' / Counts in 1-3 A CPCounter detector TFORM11 = 'J ' / data format of field: 4-byte INTEGER TUNIT11 = 'count ' / physical unit of field TTYPE12 = 'CNT_3_9 ' / Count in 3-9 A TPCounter detector TFORM12 = 'J ' / data format of field: 4-byte INTEGER TUNIT12 = 'count ' / physical unit of field TTYPE13 = 'CNT_6_18' / Count in 6-18 A TPCounter detector TFORM13 = 'J ' / data format of field: 4-byte INTEGER TUNIT13 = 'count ' / physical unit of field TTYPE14 = 'CNT_CPM ' / Count in the channel photomultiplier TFORM14 = 'J ' / data format of field: 4-byte INTEGER TUNIT14 = 'count ' / physical unit of field TTYPE15 = 'SHUTTER ' / Shutter flag : 0=bkg, 1=stellar TFORM15 = 'J ' / data format of field: 4-byte INTEGER TTYPE16 = 'PHA_DET ' / PHA discriminator for which detector TFORM16 = 'J ' / data format of field: 4-byte INTEGER TTYPE17 = 'PHA_CNT ' / Six channel spectrum TFORM17 = '6J ' / data format of field: 4-byte INTEGER TUNIT17 = 'count ' / physical unit of field TTYPE18 = 'PHA_TOT ' / Total PHA count TFORM18 = 'J ' / data format of field: 4-byte INTEGER TUNIT18 = 'count ' / physical unit of field TTYPE19 = 'GRD_1_3 ' / Guard Counts in the 1-3 A TFORM19 = 'J ' / data format of field: 4-byte INTEGER TUNIT19 = 'count ' / physical unit of field TTYPE20 = 'GRD_3_9 ' / Guard Counts in the 3-9 A TFORM20 = 'J ' / data format of field: 4-byte INTEGER TUNIT20 = 'count ' / physical unit of field TTYPE21 = 'GRD_6_18' / Guard Counts in the 6-18 A TFORM21 = 'J ' / data format of field: 4-byte INTEGER TUNIT21 = 'count ' / physical unit of field TTYPE22 = 'SEN_1_3 ' / Sensitivity flag in the 1-3 A TFORM22 = 'J ' / data format of field: 4-byte INTEGER TTYPE23 = 'SEN_3_9 ' / Sensitivity flag in the 3-9 A TFORM23 = 'J ' / data format of field: 4-byte INTEGER TTYPE24 = 'SEN_6_18' / Sensitivity flag in the 6-18 A TFORM24 = 'J ' / data format of field: 4-byte INTEGER TTYPE25 = 'PSDS_1_3' / Pulse shape discriminator speed TFORM25 = 'J ' / data format of field: 4-byte INTEGER TTYPE26 = 'PSDM_1_3' / Pulse shape discriminator mode TFORM26 = 'J ' / data format of field: 4-byte INTEGER TTYPE27 = 'HTF_1_3 ' / High Tension flag 1-3 A TFORM27 = 'J ' / data format of field: 4-byte INTEGER TTYPE28 = 'HTF_3_9 ' / High tension flag 6-9 A TFORM28 = 'J ' / data format of field: 4-byte INTEGER TTYPE29 = 'HTF_6_18' / High tension flag for 6-18 A TFORM29 = 'J ' / data format of field: 4-byte INTEGER TTYPE30 = 'HTF_CPM ' / High tension flag for CPM TFORM30 = 'J ' / data format of field: 4-byte INTEGER TTYPE31 = 'HEATFLAG' / Experiment heater flag TFORM31 = 'J ' / data format of field: 4-byte INTEGER TTYPE32 = 'BKGDMODE' / Background alternate flag TFORM32 = 'J ' / data format of field: 4-byte INTEGER TTYPE33 = 'LOWVLTFL' / Low voltage (0=on 1=off) TFORM33 = 'J ' / data format of field: 4-byte INTEGER TTYPE34 = 'LOWVLTMD' / Low voltage power supply (0=A, 1=B) TFORM34 = 'J ' / data format of field: 4-byte INTEGER TTYPE35 = 'IRIS ' / Code size FOV (1=small 2=large 3=intermediate) TFORM35 = 'J ' / data format of field: 4-byte INTEGER TTYPE36 = 'FILTER ' / Filter selected (value 1-4) TFORM36 = 'J ' / data format of field: 4-byte INTEGER TTYPE37 = 'ANTELGRP' / Analog telemetry group (group B 1 = group A) TFORM37 = 'J ' / data format of field: 4-byte INTEGER TTYPE38 = 'OPMODE ' / Operational mode 0=normal 1=calibration TFORM38 = 'J ' / data format of field: 4-byte INTEGER TTYPE39 = 'STYAXIS ' / Star tracker Y axis counter TFORM39 = 'J ' / data format of field: 4-byte INTEGER TTYPE40 = 'STZAXIS ' / Star tracker Z axis counter TFORM40 = 'J ' / data format of field: 4-byte INTEGER TTYPE41 = 'ANA_TEL1' / Analog telemetry word 1 TFORM41 = 'J ' / data format of field: 4-byte INTEGER TTYPE42 = 'ANA_TEL2' / Analog telemetry word 2 TFORM42 = 'J ' / data format of field: 4-byte INTEGER TTYPE43 = 'ANA_TEL3' / Analog telemetry word 3 TFORM43 = 'J ' / data format of field: 4-byte INTEGER TTYPE44 = 'ANA_TEL4' / Analog telemetry word 4 TFORM44 = 'J ' / data format of field: 4-byte INTEGER TTYPE45 = 'ANA_TEL5' / Analog telemetry word 5 TFORM45 = 'J ' / data format of field: 4-byte INTEGER EXTNAME = 'SPECTRA ' / name of this binary table extension 1CTYP17 = 'CHANNEL ' / Axis type 1CUNI17 = 'chan ' / Physical Units of the Axis CTYP17 1CRVL17 = 1 / Channel value for reference pixel 1CRPX17 = 1 / Reference pixel ORIGIN = 'HEASARC/GSFC/NASA' / Origin of FITS file TELESCOP= 'COPERNICUS' / Telescope (mission) name INSTRUME= 'UCLXE ' / Instrument name HDUCLASS= 'OGIP ' / Format conforms to OGIP standard HDUCLAS1= 'TEMPORALDATA' / Contains non-science data vs. time HDUCLAS2= 'COMBINED' / Contains HK and data DATE-OBS= '02/02/74' / Start date of observation (dd/mm/yy) TIME-OBS= '07:03:28' / Start time of observation (hh:mm:ss) DATE-END= '02/02/74' / End date of observation (dd/mm/yy) TIME-END= '08:58:50' / End time of observation (hh:mm:ss) MJDREF = 4.131600000000000E+04 / Reference time in MJD TIMESYS = '1972 1 0 00:00:00' / Ref. time in YYYY MM DD hh:mm:ss TIMEREF = 'LOCAL ' / Reference frame for the times TASSIGN = 'SATELLITE' / Place of time assignment CLOCKAPP= F / True if clock correction applied TIMEUNIT= 's ' / Unit for TSTART,TSTOP,and TIMEZER TSTART = 6.603500800000000E+07 / Start time counted from TIMESYS TSTOP = 6.604193000000000E+07 / Stop time counted from TIMESYS TELAPSE = 6.922000000000000E+03 / Elapsed time of observation TIMEPIXR= 0.0 / Time stamps refer to start of each pixel TIMEDEL = 62.509 / Integration time in TIMEUNIT OBS_MODE= 'POINTING' / Observation mode OBJECT = 'X PERSEI' / Original Copernicus source designation CATID1 = 'X PER ' / Source designation match, NONE if null IDHEADER= 'HEAD ' / Data Type COMMENT Catalog name : SIMBAD RA_OBJ = 5.80628500E+01 / Right Ascension from match, -999.0 if null DEC_OBJ = 3.09001870E+01 / Declination from match, -999.0 if null EQUINOX = 1950.0 / Equinox of coordinate system RADECSYS= 'FK4 ' / Coordinate system CREATOR = 'copx2fits' / s/w task which wrote this dataset TOTCN13 = 2646 / Total 1 - 3 A detector counts TOTCN39 = 161 / Total 3 - 9 A detector counts TOTCN618= 116 / Total 6 - 18 A detector counts TOTCNCPM= 0 / Total CPM detector counts AVECN13 = 49.9245 / Average 1 - 3 A detector counts AVECN39 = 3.0377 / Average 3 - 9 A detector counts AVECN618= 2.1887 / Average 6 - 18 A detector counts AVECNCPM= 0.0000 / Average CPM detector counts AVEGC13 = 1443.9623 / Average 1 - 3 A guard counts AVEGC39 = 2311.0188 / Average 3 - 9 A guard counts AVEGC618= 3726.3208 / Average 6 - 18 A guard counts HISTORY The UCL X-ray Experiment (UCLXE) package consisted of four telescopes HISTORY operating simultaneously. The main telescope used during the mission HISTORY was the 1-3 angstrom proportional counter which had a simple tube HISTORY for collimation. The field of view (FOV) was asymmetric with a full HISTORY width half maximum of 2.5 deg X 3.5 deg and an effective area of HISTORY 17.8 cm**2. The other three telescopes were Wolter type 0 grazing HISTORY incidence telescopes with a dedicated detector. HISTORY Two were proportional counter (3-9 angstrom and 6-18 angstrom) and HISTORY the other a channel photomultiplier (CPM). The CPM suffers UV HISTORY contamination and provided no useful data. HISTORY The FOV (and the effective area) of the 3-9 and 6-18 angstrom HISTORY proportional counters could be set by using stops at the foci of HISTORY the telescopes. The 3-9 angstrom FOVs were 10 arcmin (large), 3.2 HISTORY arcmin (intermediate) and 1.8 arcmin (small) corresponding to 3.7, HISTORY 2.4 and 1 in cm**2 effective area respectively. The FOVs for the HISTORY 6-18 angstrom detector were instead 10, 6 or 2 arcmin corresponding HISTORY to 12.3, 11.3 or 7.6 in cm**2 effective area. The 3-9 and 6-18 HISTORY angstrom telescopes became inoperable in July 1973 following the HISTORY failure of the background shutter. HISTORY A six Pulse Height Analyzer (PHA) could be connected to any of the HISTORY three proportional counters and used to extract spectral information. HISTORY The basic time resolution was 62.509 seconds followed by 24 seconds HISTORY dead time. This resulted in a 86.509 sampling time. It was possible HISTORY to achieve higher time resolution, down to about 2 sec, with the HISTORY usage of the J20 mode. This mode was used only in few occasions and HISTORY was not scientifically useful. HISTORY ---------------------------------------------------------------------- HISTORY This fits file contains data taken with all the telescopes. HISTORY All the fields found in the original data records were maintained in HISTORY the FITS file and three extra columns, TIME , PHA_SUM and TDIFF added. HISTORY The column description as given in the original documentation is HISTORY listed below. The TIMEDEL keyword value is always set to 62.509 sec HISTORY even when the J20 mode was operating. If J20 was in used the time HISTORY stamp is identical for many tens of rows. The usage of these are not HISTORY recommended. HISTORY TIME : seconds since the header keyword MJDREF HISTORY HOURS,MINUTES, SECONDS : store the UT time of the data frame HISTORY start as was in the original file HISTORY DAY and YEAR : day of the year and year HISTORY ORBITADS: the orbital address (value 0-63) HISTORY OBS_CNSTR: orbital constrain (value 1-11) HISTORY The values have the following meaning: HISTORY 1 = no constrain, HISTORY 2 = observation through earth atmosphere, HISTORY 3 = pointing sunlight earth, HISTORY 4 = pointing dark earth HISTORY 5 = South Atlantic Anomaly HISTORY 6-8 = unknown HISTORY 9 = pointing near Sun HISTORY 10 = pointing near moon HISTORY 11 = observation during spacecraft night HISTORY TIME_ACPT: count acceptance period (value 0-127). If not zero HISTORY indicates the length in time (in spacecraft half HISTORY seconds) the experiment was counting before one of HISTORY the scalars filled (only for bright sources). It is HISTORY a measurement of how quickly the counter saturate. HISTORY CNT_1_3, CNT_3_9, CNT_6_18, and CNT_CPM HISTORY record the counts in the four detectors (value 0-4095) HISTORY SHUTTER, background shutter flag 0 = background 1 = stellar HISTORY PHA_DET : indicates which proportional counters fed the PHA HISTORY 1 = 3-9 angstrom HISTORY 2 = 1-3 angstrom HISTORY 3 = 6-18 angstrom HISTORY PHA_CNT: six channel spectrum HISTORY PHA_SUM: total counts records in the PHA_CNT HISTORY GRD_1_3, GRD_3_9, GRD_6_18: records the guard counts HISTORY (value 0-4095) particle background HISTORY SEN_1_3: SEN_3_9, SEN_6_18 gain mode(0=low 1=high) HISTORY PSDS_1_3: pulse shape discriminator speed (rise time HISTORY 0=slow 1=fast) HISTORY PSDM_1_3: pulse shape discriminator mode (rise time HISTORY 0=on 1=off) HISTORY HTF_1_3, HTF_3_9, HTF_6_18 and HTF_CPM: High tension flag HISTORY for detector (0=off 1=on) HISTORY HEATFLAG: experiment heater (0=on 1=off) HISTORY BKGMODE: background alternate mode (0=on 1=off) HISTORY LOWVLTFL: low voltage (0=on 1=off) HISTORY LOWVLTMD: low voltage power supply(0=supply A, 1=supply B) HISTORY IRIS: iris selected (value 1-4). This determinate the FOV HISTORY 1= small 2= large 3 intermediate HISTORY FILTER: filter selected (value 1-4) HISTORY ANTELGRP: analog telemetry group (group B 1 = group A) HISTORY OPMODE: operation mode (0=normal 1=calibration) HISTORY STYAXIS: star-tracker Y axis count (value 0-31) HISTORY STZAXIS: star-tracker Z axis count (value 0-31) HISTORY ANA_TEL1, ANA_TEL2, ANA_TEL3, ANA_TEL4, and HISTORY ANA_TEL5: analog telemetry words HISTORY TDIFF: time difference in seconds between subsequent rows HISTORY ---------------------------------------------------------------------- HISTORY The original file structure contained a header followed by data HISTORY records. Data and header records consisted of 47 words. Two types HISTORY of header record were present in the files storing different HISTORY parameters. A string set to HEAD or SL (kept in this fits file HISTORY in the keyword IDHEADER) identified the header type. The SL data HISTORY are raster scan around a source position set in the HEAD observation HISTORY immediately preceding (in time) the SL observation. HISTORY In the HEAD header only the first 12 words were used to store HISTORY word(1-2)=HEAD, word(3)= month, word(4)=day word(5)=year, HISTORY word(6)=day of year, word(7-12)=target name. The SL header the HISTORY words(6-14) and words(30-47) were unused, the others contain: HISTORY words(1-3) = hour min and sec; word(4)=SL; word(5)=constrain flag; HISTORY words(15-19), words(20-24) and words(25-29) contain the pitch yaw HISTORY and roll information respectively. Although the documentation HISTORY reports that no other words in either header type (HEAD and SL type) HISTORY were used, the content of the entire record are kept for HISTORY completeness in the HISTORY card listed below. HISTORY ********************************************************************** HISTORY HEAD| 2| 2| 1974| 33| HISTORY X PERSEI | 57| 108| 110| 75| 45| 29| 3449| 2809| HISTORY 3813| 1| 1| 1| 0| 0| 1| 1| 1| 0| HISTORY 0| 0| 0| 0| 2| 3| 1| 0| 2| 2| HISTORY 88| 169| 172| 197| 147| 33| 1974| HISTORY ********************************************************************** HISTORY The header of original HEAD data file did not contain coordinates, HISTORY but only the object name and the observation log was not available HISTORY in a suitable form when these FITS files were created. The coordinates HISTORY in the RA_OBJ and DEC_OBJ keywords, for the fits file with HISTORY IDHEADER=HEAD, were obtained by cross-correlating the object name HISTORY with various catalogs available from HEASARC and SIMBAD and with the HISTORY object name listed in the archive of the Copernicus "Princeton HISTORY Experiment Package" (COP_PEP). In a few cases coordinates were HISTORY assigned using the observation log. HISTORY The SL files instead did not contain either coordinates or object HISTORY name. The RA_OBJ, DEC_OBJ, OBJECT keywords, in fits file with HISTORY IDHEADER=SL, are retained from the HEAD observation immediately HISTORY preceding (in time) the current SL file. CHECKSUM= 'kAiak7ZXkAfak7ZW' / HDU checksum updated 1999-05-11T12:20:59 DATASUM = '2495952283' / data unit checksum updated 1999-05-11T12:20:59 END |
HEASARC Staff Scientist Position - Applications are now being accepted for a Staff Scientist with significant experience and interest in the technical aspects of astrophysics research, to work in the High Energy Astrophysics Science Archive Research Center (HEASARC) at NASA Goddard Space Flight Center (GSFC) in Greenbelt, MD. Refer to the AAS Job register for full details.
