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IX/26    Einstein Observatory, Revision 1B. Processings     (Giacconi+, 1979)

Einstein Observatory, the 1B data revision tables and results. Giacconi et al. < > =
Title of the paper AUTHORS <Reference (19YY)> =19YYjjjjjvvvvLppppA (SIMBAD/NED BibCode)
ADC_Keywords: X-ray sources ; Surveys Mission_Name: Einstein Description: Various parameters for the IPC observations of the Einstein Observatory in the Rev1B Processing. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file r1b_det.dat 553 18780 Source Detection Parameters for Rev1B Processing r1b_rad.dat 386 18780 Count distributions for Rev 1B IPC sources r1b_spc.dat 388 18780 IPC Spectral Information from Rev1B Processing r1b_sum.dat 298 18780 Summary of Observation Parameters for Rev1B Sources r1b_var.dat 96 18780 Variability Parameters for Rev1B Processing
See Also: IX/22 : The CfA Einstein observatory extended deep X-ray survey IX/23 : Einstein Observatory Source Catalog IX/24 : The Einstein Observatory High Resolution Imager Source List IX/25 : Einstein Observatory Imaging Proportional Counter (IPC) Parameters IX/27 : Einstein Observatory Catalog (OCAT or Yellow Book) Description of table r1b_det.dat: This table contains source detection parameters for IPC observations of the Einstein Observatory. Parameters are divided into two groups depending on whether the source was detected with Ldetect or Mdetect (see IX/23/source.dat for a description of the detect algorithms). Each group is further subdivided to give information pertaining to each energy band; soft (0.16-0.8 keV), hard (0.8-3.5 keV), and broad (0.16-3.5 keV) for a given source. Byte-by-byte Description of file: r1b_det.dat
Bytes Format Units Label Explanations
2- 6 I5 --- Seqno IPC Sequence Number (G1) 8- 9 I2 --- rev1b IPC Rev1b source number (G2) 11- 12 I2 h RAh Right Ascension (B1950) (hour) 14- 15 I2 min RAm Right Ascension (B1950) (min) 17- 20 F4.1 s RAs Right Ascension (B1950) (sec) 22 A1 --- DE- Declination sign (B1950) 23- 24 I2 deg DEd Declination (B1950) (deg) 26- 27 I2 arcmin DEm Declination (B1950) (arcmin) 29- 30 I2 arcsec DEs Declination (B1950) (arcsec) 32- 38 F7.3 pix LHypos Y position: Ldetect in hard band (1) 40- 46 F7.3 pix LHzpos Z position: Ldetect in hard band (1) 48- 53 F6.3 pix e_LHypos Radius of error circle (1) 55- 60 F6.0 ct LHccnts Cell counts: Ldetect in hard band (2) 62- 68 F7.3 ct e_LHccnts Error on LH cell counts (2) 70- 78 F9.3 ct LHbcnts Background cell counts: Ldetect hard band (3) 80- 86 F7.3 ct e_LHbcnts Error on LH background cell counts (3) 88- 97 F10.3 ct LHncnts Net cell counts: Ldetect in hard band (4) 99-105 F7.3 ct e_LHncnts Error on LH net cell counts (4) 107-115 F9.3 ct LHthrc Threshold cell counts: Ldetect hard band (5) 117-123 F7.3 --- LH_SNR Signal-to-noise ratio: Ldetect hard band (5) 125-131 F7.3 pix LBypos Y position: Ldetect in broad band (1) 133-139 F7.3 pix LBzpos Z position: Ldetect in broad band (1) 141-146 F6.3 pix e_LBypos Radius of error circle (1) 148-153 F6.0 ct LBccnts Cell counts: Ldetect in broad band (2) 155-161 F7.3 ct e_LBccnts Error on LB cell counts (2) 163-171 F9.3 ct LBbcnts Backgrnd cell counts: Ldetect broad band (3) 173-179 F7.3 ct e_LBbcnts Error on LB background cell counts (3) 181-190 F10.3 ct LBncnts Net cell counts: Ldetect in broad band (4) 192-199 F8.3 ct e_LBncnts Error on LB net cell counts (4) 201-209 F9.3 ct LBthrc Threshold cell counts: Ldetect broad band (5) 211-218 F8.3 --- LB_SNR Signal-to-noise ratio: Ldetect broad band (5) 220-226 F7.3 pix LSypos Y position: Ldetect in soft band (1) 228-234 F7.3 pix LSzpos Z position: Ldetect in soft band (1) 236-241 F6.3 pix e_LSypos Radius of error circle (1) 243-248 F6.0 ct LSccnts Cell counts: Ldetect in soft band (2) 250-256 F7.3 ct e_LSccnts Error on LS cell counts (2) 258-265 F8.3 ct LSbcnts Background cell counts: Ldetect soft band (3) 267-272 F6.3 ct e_LSbcnts Error on LS background cell counts (3) 274-282 F9.3 ct LSncnts Net cell counts: Ldetect in soft band (4) 284-290 F7.3 ct e_LSncnts Error on LS net cell counts (4) 292-299 F8.3 ct LSthrc Threshold cell counts: Ldetect soft band (5) 301-307 F7.3 --- LS_SNR Signal-to-noise ratio: Ldetect soft band (5) 309-315 F7.3 pix MHypos Y position: Mdetect in hard band (1) 317-323 F7.3 pix MHzpos Z position: Mdetect in hard band (1) 325-330 F6.3 pix e_MHypos Radius of error circle (1) 332-336 F5.0 ct MHccnts Cell counts: Mdetect in hard band (2) 338-343 F6.3 ct e_MHccnts Error on MH cell counts (2) 345-351 F7.3 ct MHbcnts Background cell counts: Mdetect hard band (3) 353-354 F2.0 ct e_MHbcnts Error on MH background cell counts (3) 356-363 F8.3 ct MHncnts Net cell counts: Mdetect in hard band (4) 365-370 F6.3 ct e_MHncnts Error on MH net cell counts (4) 372-378 F7.3 ct MHthrc Threshold cell counts: Mdetect hard band (5) 380-385 F6.3 --- MH_SNR Signal-to-noise ratio: Mdetect hard band (5) 387-393 F7.3 pix MBypos Y position: Mdetect in broad band (1) 395-401 F7.3 pix MBzpos Z position: Mdetect in broad band (1) 403-408 F6.3 pix e_MBypos Radius of error circle (1) 410-414 F5.0 ct MBccnts Cell counts: Mdetect in broad band (2) 416-421 F6.3 ct e_MBccnts Error on MB cell counts (2) 423-429 F7.3 ct MBbcnts Backgrnd cell counts: Mdetect broad band (3) 431-432 F2.0 ct e_MBbcnts Error on MB background cell counts (3) 434-441 F8.3 ct MBncnts Net cell counts: Mdetect in broad band (4) 443-448 F6.3 ct e_MBncnts Error on MB net cell counts (4) 450-456 F7.3 ct MBthrc Threshold cell counts: Mdetect broad band (5) 458-463 F6.3 --- MB_SNR Signal-to-noise ratio: Mdetect broad band (5) 465-471 F7.3 pix MSypos Y position: Mdetect in soft band (1) 473-479 F7.3 pix MSzpos Z position: Mdetect in soft band (1) 481-486 F6.3 pix e_MSypos Radius of error circle (1) 488-492 F5.0 ct MSccnts Cell counts: Mdetect in soft band (2) 494-499 F6.3 ct e_MSccnts Error on MS cell counts (2) 501-507 F7.3 ct MSbcnts Background cell counts: Mdetect soft band (3) 509-510 F2.0 ct e_MSbcnts Error on MS background cell counts (3) 512-519 F8.3 ct MSncnts Net cell counts: Mdetect in soft band (4) 521-526 F6.3 ct e_MSncnts Error on MS net cell counts (4) 528-534 F7.3 ct MSthrc Threshold cell counts: Mdetect soft band (5) 536-541 F6.3 --- MS_SNR Signal-to-noise ratio: Mdetect soft band (5) 543 A1 --- MS_cmpf [01] '1' if src has component in this method/band (6) 545 A1 --- MH_cmpf [01] '1' if src has component in this method/band (6) 547 A1 --- MB_cmpf [01] '1' if src has component in this method/band (6) 549 A1 --- LS_cmpf [01] '1' if src has component in this method/band (6) 551 A1 --- LH_cmpf [01] '1' if src has component in this method/band (6) 553 A1 --- LB_cmpf [01] '1' if src has component in this method/band (6)
Note (1): The 'XXypos' and 'XXzpos' columns give the Y,Z pixel location for each source in each band. The 'e_XXypos' column gives the radius, in pixels, of the error circle used to calculate the error on the source and background counts. In the case where a source was not detected with one of the detect method/energy band combinations, these quantities are set to zero. The error circles are 90% confidence level, statistically added in quadrature with 0.5' systematic errors for each of the three energy bands. Note: XX is any of LH = Ldetect in hard band LB = Ldetect in broad band LS = Ldetect in soft band MH = Mdetect in hard band MB = Mdetect in broad band MS = Mdetect in soft band Note (2): These columns give the number of counts and the corresponding error for each detected source, for each detect method and energy band which applies. In the case where a source was not detected with one of the detect method/energy band combinations, these quantities are set to zero. Note (3): These columns give the number of counts and the corresponding error for the background of each detected source, for each detect method and energy band which applies. In the case where a source was not detected with one of the detect method/energy band combinations, these quantities are set to zero. Note (4): These columns give the number of net counts and the corresponding error for each detected source, for each detect method and energy band which applies. In the case where a source was not detected with one of the detect method/ energy band combinations, these quantities are set to zero. Note (5): These columns give the threshold cell count and signal-to-noise ratio for each detected source, for each detect method and energy band which applies. The threshold cell count is a detection threshold set to give, on average, one false source per field. In the case where a source was not detected with one of the detect method/energy band combinations, these quantities are set to zero. Note (6): These columns give flags which describe whether or not a given source has a component detected with the method in this energy band. The flag is set to "1" if a source was detected with the given detection method and energy band. Note: lh = Ldetect in hard band lb = Ldetect in broad band ls = Ldetect in soft band mh = Mdetect in hard band mb = Mdetect in broad band ms = Mdetect in soft band
Description of table r1b_rad.dat: This table gives count distributions for IPC sources detected in Rev1B processing. This information is contained in the radial table of the Rev1B standard processing output. Incomplete as of 12/91 (some sequence numbers are missing and entries are 0.0). Byte-by-byte Description of file: r1b_rad.dat
Bytes Format Units Label Explanations
2- 6 I5 --- Seqno Sequence Number (G1) 8- 9 I2 --- rev1b Rev1b Source Number (G2) 11- 12 I2 h RAh Right Ascension (B1950) (hour) 14- 15 I2 min RAm Right Ascension (B1950) (min) 17- 20 F4.1 s RAs Right Ascension (B1950) (sec) 22 A1 --- DE- Declination sign (B1950) 23- 24 I2 deg DEd Declination (B1950) (deg) 26- 27 I2 arcmin DEm Declination (B1950) (arcmin) 29- 30 I2 arcsec DEs Declination (B1950) (arcsec) 32- 36 F5.3 --- hpe High ph band extent (2) 38- 43 F6.3 --- e_hpe High ph band extent error (2) 45- 49 F5.0 pix sabkg Source annulus area background (3) 51- 55 F5.0 pix sarea Source circle area (3) 56-115 10F6.3 pix SR10_ Outer radius of annulus with 10% of soft cts (4) 116-205 10F9.3 ct SC10_ Net counts in annulus with 10% of soft cts (5) 207-215 F9.3 ct Stcts Total net soft counts within r=5' (6) 216-275 10F6.3 pix HR10_ Outer radius of annulus with 10% of hard cts (4) 276-375 10F10.3 ct HC10_ Net counts in annulus with 10% of hard cts (5) 377-386 F10.3 ct Htcts Total net hard counts within r=3' (7)
Note (2): These columns give the high ph band extent and corresponding error. The hi ph band extent is an estimate of source extent using ph bands 5-9. The hiphextent is calculated only for sources which had sufficient counts in a 3' radius in the broad band. The number is based on a comparison of source counts within 1.0 arcmin with those in an annulus from 1.0 to 2.0 arcmin. This ratio is then compared with the same ratio calculated for Gaussian functions so that the corresponding FWHM (Full Width Half Max) of a Gaussian with the same ratio will be an estimate of the source size. Hiphextent is the FWHM (given in arcmin) of a Gaussian which, when convolved with the appropriate detector response, gives the observed ratio. If the extent was not calculated, these numbers will be 0. Note (3): The "sabkg" column gives the area of the annulus (in square 8" pixels) used for background subtraction. The "sarea" column gives the area of the source circle (annulus and circle pixels with rib/edge shadows and other sources subtracted). Note (4): These columns give the outer radii (in pixels) of annuli containing ten percent of net counts within 5' radius circle for PH bins 2-4. If these numbers are all zero, the radial information for this source has probably not yet been included in this table. A more complete version of this table is in the works. If the numbers for PH bins 5-9 are all zero, the radial information for this source has probably not yet been included in this table. A more complete version of this table is in the works. Note (5): These columns give the net counts within annuli containing ten percent of net counts within 5' radius circle for PH bins 2-4. If these numbers are all zero, the radial information for this source has probably not yet been included in this table. A more complete version of this table is in the works. If the numbers for PH bins 5-9 are all zero, the radial information for this source has probably not yet been included in this table. A more complete version of this table is in the works. Note (6): This column gives the total net counts within r=5' for PH bins 2-4. If this is zero, the radial information for this source has probably not yet been included in this table. A more complete version of this table is in the works. Note (7): This column gives the total net counts within r=3' for PH bins 5-9. If this is zero, the radial information for this source has probably not yet been included in this table. A more complete version of this table is in the works.
Description of table r1b_spc.dat: This table contains source counts for each IPC spectral Channel (both PHA -- "pulse height analysis" and PI -- "pulse independent" channels). PI channels are well-defined energy channels whereas PHA channels require a knowledge of the detector's high voltage (gain) in order to determine the central energy and width of each channel. The gain of the detector, or the BAL, can be found in the table IX/25/ipcihut.dat Byte-by-byte Description of file: r1b_spc.dat
Bytes Format Units Label Explanations
2- 6 A5 --- Seqno IPC Sequence Number (G1) 8- 9 I2 --- rev1b IPC Rev1b source number (G2) 11- 12 I2 h RAh Right Ascension (B1950) (hour) 14- 15 I2 min RAm Right Ascension (B1950) (min) 17- 20 F4.1 s RAs Right Ascension (B1950) (sec) 22 A1 --- DE- Declination sign (B1950) 23- 24 I2 deg DEd Declination (B1950) (deg) 26- 27 I2 arcmin DEm Declination (B1950) (arcmin) 29- 30 I2 arcsec DEs Declination (B1950) (arcsec) 31-126 16I6 ct PIsp PI spectra within a circle of radius=3' (1) 127-206 16I5 ct PIbg PI background counts from circle (r=5' to 6') (2) 207-302 16I6 ct PHsp PH spectra within a circle (r=3') (3) 303-382 16I5 ct PHbg PH background counts from circle (r=5' to 6') (4) 384 A1 --- fitflag Spectral fitting flag (5) 386 I1 --- HR Rev 1B (incorrect) hardness ratio (6) 388 I1 --- e_HR Rev 1B (incorrect) hardness ratio error (6)
Note (1): These columns gives the total raw counts in each of the 16 pulse independent channels. They are measured within a 3' circle at the source position. Note (2): These columns give the background counts for each of the 16 pulse independent channels. The background counts are measured in an annulus from 5' to 6' at the source position. They have been normalized to the same area as the source circle. Note (3): These columns give the total raw counts in each of the 16 pulse height analysis channels. The counts are given within a 3' circle at the source position. Note (4): These columns give the background counts for each of the 16 pulse height analysis channels. The background counts are measured in an annulus from 5' to 6' at the source position. They have been normalized to the same area as the source circle. Note (5): This column gives the spectral fitting flag. The results, however, are not available in this database. The spectral fitting algorithms were only run for strong sources within the central area of the detector, and the flag is then set to 1. If the spectral fitting analysis was not done in standard Rev1B processing, the entry in this column will be 0. Note (6): These columns give the Rev1B hardness ratio and error from standard processing. These ratios were found to be incorrect and recomputed for the Einstein Observatory Source Catalog. For the corrected hardness ratio and a full description of this quantity, see the table IX/23/source.dat. If these entries are zero, there were too few counts to calculate the hardness ratio reliably.
Description of table r1b_sum.dat: This table describes observation parameters for IPC sources detected in the Rev1B standard processing. The most useful source information is summarized in this table. Byte-by-byte Description of file: r1b_sum.dat
Bytes Format Units Label Explanations
2- 6 A5 --- Seqno IPC Sequence Number (G1) 8- 9 I2 --- rev1b IPC Rev1b source number (G2) 11- 12 A2 --- pcod [LMSHB] Pcod flag - origin of position (1) 14- 20 F7.3 pix ypos Pcod Y pixel position (2) 22- 28 F7.3 pix zpos Pcod Z pixel position (2) 30- 35 F6.3 pix yzp_err Pixel radius of error circle (2) 37- 38 I2 h RAh Right Ascension (B1950) (hour) 40- 41 I2 min RAm Right Ascension (B1950) (min) 43- 46 F4.1 s RAs Right Ascension (B1950) (sec) 48- 54 F7.5 rad ra_err Right ascension error (3) 56 A1 --- DE- Declination sign (B1950) 57- 58 I2 deg DEd Declination (B1950) (deg) 60- 61 I2 arcmin DEm Declination (B1950) (arcmin) 63- 64 I2 arcsec DEs Declination (B1950) (arcsec) 66- 72 F7.5 rad dec_err Declination error (3) 74- 81 F8.5 rad GLONr Pcod galactic longitude (4) 83- 89 F7.5 rad e_GLONr Galactic longitude error (4) 91- 98 F8.5 rad GLATr Pcod galactic latitude (4) 100-106 F7.5 rad e_GLATr Galactic latitude error (4) 108-112 F5.3 --- vigncorr Vignetting correction (5) 114-119 F6.0 ct SBcts Pcod position cell counts in soft band (6) 121-127 F7.3 ct e_SBcts Error on cell counts in soft band (6) 129-135 F7.0 ct HBcts Pcod position cell counts in hard band (6) 137-143 F7.3 ct e_HBcts Error on cell counts in hard band (6) 145-151 F7.0 ct BBcts Pcod position cell counts in broad band (6) 153-159 F7.3 ct e_BBcts Error on cell counts in broad band (6) 161-167 F7.3 ct SBbgcts Pcod cell background counts in soft band (7) 169-173 F5.3 ct e_SBbgcts Error on cell background counts in soft band (7) 175-181 F7.3 ct HBbgcts Pcod cell background counts in hard band (7) 183-187 F5.3 ct e_HBbgcts Error on cell background counts in hard band (7) 189-195 F7.3 ct BBbgcts Pcod cell background counts in broad band (7) 197-201 F5.3 ct e_BBbgcts Error on cell background counts, broad band (7) 203-211 F9.3 ct/s SBccrate Pcod corrected count rate in soft band (8) 213-219 F7.3 ct/s e_SBccrate Error on corrected count rate in soft band (8) 221-229 F9.3 ct/s HBccrate Pcod corrected count rate in hard band (8) 231-237 F7.3 ct/s e_HBccrate Error on corrected count rate in hard band (8) 239-247 F9.3 ct/s BBccrate Pcod corrected count rate in broad band (8) 249-255 F7.3 ct/s e_BBccrate Error on corrected count rate in broad band (8) 257-259 F3.0 mW/m2 SBflux Pcod source flux in soft band (9) 261-262 F2.0 mW/m2 e_SBflux Error on source flux in soft band (9) 264-266 F3.0 mW/m2 HBflux Pcod source flux in hard band (9) 268-269 F2.0 mW/m2 e_HBflux Error on source flux in hard band (9) 271-273 F3.0 mW/m2 BBflux Pcod source flux in broad band (9) 275-276 F2.0 mW/m2 e_BBflux Error on source flux in broad band (9) 278-280 F3.0 mW/m2 EBflux Pcod source flux in Einstein band (9) 282-283 F2.0 mW/m2 e_EBflux Error on source flux in Einstein band (9) 285-289 F5.3 --- prffit PRF fit (10) 291-294 I4 --- reco Combined ribs and edges code (11) 296-298 F3.1 --- sel_flag Flagged 0.0 if source included in EOSCAT (12)
Note (1): The 'pcod' column gives the detection method and band which describes the origin of the position used to obtain source counts on the summary page of standard Rev1B processing output (this table). There are six combinations which describe the detection method and band for each IPC source detected; these combinations are given by a two-digit code, with the first digit representing the detection method (L for local detect, or M for map detect), and the second digit representing the spectral band used in detection (S for soft, H for hard, or B for broad). 'pcod' describes from which method/band combination the position is given; it is the first available one from the following prioritized order: MH, MB, MS, LH, LB, LS. Note (2): The 'ypos' and 'zpos' columns give the Y,Z pixel location for each source. The use of 'pcod' describes the origin of the position (see above). The pixel radius of the error circle is given in the 'yzp_err' column. Note (3): These columns give the right ascension and declination (B1950) (and the corresponding errors in radians), which describe the location of the source for the detection. The use of 'pcod' describes the origin of the position (see above). Note (4): These columns give the galactic longitude and galactic latitude (and the corresponding errors) which describe the location of the source for the detection. They are given in radians. The use of 'pcod' describes the origin of the position (see above). Note (5): This column gives the Rev 1B vignetting correction, a correction which accounts for the loss of effective area off-axis. Note (6): These columns give the source counts (and corresponding 1 sigma error) within the detection cell at the source position for the soft, hard, and broad energy bands. The detect cell in the soft band is 30x30 pixels (16 sq. arcmin); the detect cell in the hard and broad bands is 18x18 pixels (5.76 sq. arcmin). Note (7): These columns give the background cell counts (and corresponding 1 sigma errors) at the pcod position for the soft, hard, and broad energy bands. Note (8): These columns give the corrected count rate (and the corresponding 1 sigma errors) for the soft, hard, and broad energy bands at the pcod position for each source. The count rates have been corrected for vignetting, scattering, and detector dead time. Note (9): These columns give the source flux (and 1 sigma error) for the soft, hard, broad, and Einstein energy bands at the pcod position for each source. The soft band is 0.2-0.8 keV and the soft flux is estimated from 2.38E-11*CCS(soft) ergs/cm**2/s. The soft band flux calculation assumes a Raymond Thermal Spectrum with kT=0.3 keV, nh=0. The hard band is 0.8-3.5 keV and the hard flux is estimated from 3.45E-11*CCS(hard) ergs/cm**2/s. The hard band flux calculation assumes a power law spectrum with a photon index of 1.5 and nh=2.E20. The broad band is 0.2-3.5 keV and the broad flux is estimated from 3.08E-11*CCS(broad) ergs/cm**2/s. The broad band flux calculation assumes a power law spectrum with a photon index of 1.5 and nh=3.E20. The Einstein band is 0.2-4.0 keV and the Einstein flux is estimated from 3.26E-10*CCS(broad) ergs/cm**2/s. The Einstein flux calculation assumes a power law spectrum with a photon index of 1.5 and nh=2.E20. The soft, hard, and broad fluxes closely correspond to the measured count rates, however, the Einstein flux is based on the broad band count rate which spans a smaller energy band. Note (10): This column gives the PRF fit, an indication of how well the photon distribution is described by the Gaussian point response function. It can be used in determining if a source is "real." Random photon distributions (i.e. false point sources) rarely produce values above 0.95, but real extended sources can produce values below 0.95. This parameter was called PSNO in the original Rev1B standard processing output. Note (11): This column gives the ribs and edges code ('reco'), a numeric flag with nonzero values indicating that the detection cell (and/or frame defined for "local detect") falls near or on a rib shadow or detector edge. The code is formed by concatenating a pair of two-digit numbers: the first (thousands and hundreds columns) gives the number (up to 16) of frame subcells potentially shadowed by the ribs or masked-field edge; the second (tens and units columns) gives the number of subcells (up to 09) within the detect box which are potentially shadowed. A value of zero indicates the source is clear from all ribs and edges. Note (12): This column gives 'sel_flag', a flag describing why the given source was not included in the Einstein Observatory Source Catalog (see IX/23/source.dat for the Catalog). The flag is set to 0.0 if the source is included in the Catalog. Otherwise, it is set to: 9.1 if no broad component exists for a source 9.2 if the snr is <3.5 for the component of choice 9.3 if the relative exposure vignetting correction is zero 1.1 if the source is in the killedsrc table and was detected by L detect. 1.2 if the source is in the killedsrc table and was detected by M detect. 9.0 if the source was not included in the catalog for another reason. (i.e. < 300 second exposure time, or the observation was made with the AL filter, or the source was detected in a merged field, in which case the sequence number is > 11000) The killedsrc table lists sources which were deleted from the catalog on the basis of a subjective judgment that the detection was spurious.
Description of table r1b_var.dat: This table gives variability parameters from standard Rev1B processing. To determine secular variability, sources were subjected to a chi-squared fit to a constant mean. This test was applied to the field background data and to all sources with more than 50 counts (source plus background) during times when the viewing geometry flag was less than 3. These are times when the telescope was pointed away from the Earth (>120 degrees from center of earth as seen from satellite) unless the satellite was well into the night side of Earth (>125d from the Sun as viewed from the center of Earth), in which case, the target must have been >86d from the center of the Earth to avoid Earth-blockage. Early standard processing also performed Fourier Analysis (until 9/26/84) to determine periodic variability. Results of both analyses are given the the varcodechisq column. Byte-by-byte Description of file: r1b_var.dat
Bytes Format Units Label Explanations
2- 6 I5 --- Seqno IPC Sequence Number (G1) 8- 9 I2 --- rev1b IPC Rev1b source number (G2) 11- 12 I2 h RAh Right Ascension (B1950) (hour) (1) 14- 15 I2 min RAm Right Ascension (B1950) (min) 17- 18 I2 s RAs Right Ascension (B1950) (sec) 20 A1 --- DE- Declination sign (B1950) (1) 21- 22 I2 deg DEd Declination (B1950) (deg) 24- 25 I2 arcmin DEm Declination (B1950) (arcmin) 27- 28 I2 arcsec DEs Declination (B1950) (arcsec) 30- 33 I4 --- chicode Variability code chisq analysis (2) 35- 45 E11.6 --- Chi2 Reduced chisq (2) 47- 50 I4 --- nChi2 Degrees of freedom (2) 52- 61 E10.5 --- Cprob Probability that source is constant (3) 63- 73 F11.7 --- eqsigma Equivalent number of sigma (3) 75- 78 I4 --- nbins Number of bins (4) 80- 87 F8.3 s bintime Bintime (4) 89- 96 F8.0 ct counts Source circle counts (5)
Note (1): These columns give the right ascension and declination (B1950) of the source. The prefix "pcod" indicates that the position was determined with one of six possible combinations of detection algorithm and energy band. Pcod is given and described in the table "r1b_sum.dat". Note (2): 'chicode' gives information about the fits done by standard processing. This information was originally given in the VARY column of the source summary table of the standard Rev1B processing output. Varcodechisq is a two byte number which states results for the fitting program(s) used. The reduced chi-squared value and the degrees of freedom are given in the Chi2 and nChi2 columns, respectively. The following values for chicode are used: code Chi-Squared Analysis Fourier Analysis ----- -------------------- ---------------- 256 Too few counts Not done 257 Too few counts Too few counts 258 Too few counts NEGATIVE indication of variability 260 Too few counts POSSIBILITY of variability 512 NEG indication of var. Not done 514 NEG indication of var. NEG indication of var. 516 NEG indication of var. POSS of variability 1024 POSS of variability Not done 1026 POSS of variability NEG indication of var. 1028 POSS of variability POSS of variability 2048 Bad Photon Timing Not done Bad Photon timing means that the time associated with the photon is out of range of the bins calculated by IPC←TIMING←CHISQ. Note (3): These columns give the probability that the source is constant (given as a fraction of 1) and the number of sigma which corresponds to this probability. The number of sigmas is the argument of the normal probability distribution which produces the same value as probconstant. Only if the probconstant is much less than 0.1 should the user start thinking seriously about variability. Note (4): These columns give the number of bins and the bin time (in seconds) used in the chi-squared analysis. The number of bins (and bin time) are determined from the number of counts in the standard circle; approximately 30 counts to a bin. Note (5): This column gives the number of counts in the 3' source circle for the detected source.
Global Notes: Note (G1): The Einstein Observatory sequence number (Seqno) is a two to five digit number which uniquely identifies the observation. The numbers were assigned sequentially at the time of proposal submission. Note (G2): The Rev 1B source number (rev1b) (one or two digit Rev 1B source number) in the field is the source number from standard processing and is given so that users may compare previous results.
References: Harnden, F.R., Jr., Fabricant, D.G., Harris, D.E., and Schwarz, J. 1984, Smithsonian Ap. Obs. Spec. Rept., No. 393. (IPC Specs) History: Prepared from the tables available at the "ADS Catalogue Service" (CfA, Harvard-Smithsonian Center for Astrophysics, Cambrigde MA) References:
(End) Francois Ochsenbein [CDS] 23-Apr-1999
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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