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IX/28A           ROSAT HRI Pointed Observations (1RXH)     (ROSAT Team, 2000)

The ROSAT Source Catalog of Pointed Observations with the High Resolution Imager (1RXH) (3rd Release) ROSAT Scientific Team <ROSAT NEWS No. 71, The ROSAT Consortium (*) (2000)> (*) Max-Planck-Institut fuer extraterrestrische Physik, Goddard Space Flight Center, Smithsonian Astrophysical Observatory Leicester University, Astrophysikalisches Institut Potsdam
ADC_Keywords: X-ray sources ; Surveys Mission_Name: ROSAT Description: The hricat.dat table contains a list of sources detected by the Standard Analysis Software System (SASS) in reprocessed, public High Resolution Imager (HRI) datasets. In addition to the parameters returned by SASS (like position, count rate, signal-to-noise, etc.) each source in the table has associated with it a set of source and sequence "flags". These flags are provided by the ROSAT data centers in the US, Germany and the UK to help the user of the ROSHRI database judge the reliability of a given source. These data have been screened by ROSAT data centers in the US, Germany, and the UK as a step in the production of the Rosat Results Archive (RRA). The RRA contains extracted source and associated products with an indication of reliability for the primary parameters. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file hricat.dat 368 108514 ROSAT Source Catalog of Pointed Observations with the High Resolution Imager (1RXH) hrishort.dat 368 10861 ROSAT Source Catalog of Pointed Observations restricted to 'firm' detections (1RXH-S) seq.dat 174 4495 ROSAT observations used for the catalogue
See also: IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) IX/11 : ROSAT PSPC Source Catalog (1RXP) IX/12 : The WGACAT version of ROSAT sources (White+ 1995) : the ROSHRI Home Page : the ROSAT User Handbook : the ROSAT User Handbook at HEASARC : the UK ROSAT Public Data Archive Byte-by-byte Description of file: hricat.dat hrishort.dat
Bytes Format Units Label Explanations
1- 16 A16 --- SeqDetec *Sequence Detection Name. 20- 21 I2 --- n_1RXH *? Number of sources sharing a common 1RXH name 23- 43 A21 --- 1RXH *Name of catalogued detection 45- 47 I3 arcsec ErrPos Total positional error 49- 58 E10.3 ct/s CRate Estimate of net count rate 60- 67 E8.2 ct/s e_CRate ?=0 Mean error on CRate 69- 73 F5.1 --- SNR Signal-to-noise ratio (truncated at 999.9) 75- 76 I2 arcmin offAxis Off axis angle averaged over observation 78- 83 I6 s ExpTime Exposure live time 85 A1 --- varFlag *[NTP] Source variability 88-100 A13 --- SRCflags *[.cdefiu_mnpavw] Source flags 102-109 A8 --- SEQflags *[.DABEFMS_+] Sequence flags 111-116 A6 "YYMMDD" ChkDate Date of sequence and source checking 118-121 A4 --- ChkSite Checker Site (MPE, AIP, GSFC or SAO) 123-126 A4 --- ChkName Checker ID 128-132 A5 --- Comment Source comment 136-141 A6 "YYMMDD" begDate Observation start date 143-148 A6 "YYMMDD" endDate Observation finish date 150-165 A16 ---- ObsID Observation Identification 167-170 A4 --- Site Processing site (MPE or USRS) 174-181 F8.4 deg RAdeg Source Right Ascension (J2000) 183-190 F8.4 deg DEdeg Source Declination (J2000) 192-199 F8.4 deg Glon Galactic Longitude 201-208 F8.4 deg Glat Galactic Latitude 210-212 F3.1 --- EPI *[0,0.5] Edge Proximity Indicator 214-219 F6.1 pix Xpos Unblocked x source position (0.5arcsec/pixel) 221-226 F6.1 pix Ypos Unblocked y source position (0.5arcsec/pixel) 228-233 F6.2 pix imXpox Blocked x source position (8arcsec/pixel) 235-240 F6.2 pix imYpox Blocked y source position (8arcsec/pixel) 242-247 F6.1 pix lev1_X SASS level 1 x coordinate (0.5arcsec/pixel) 249-254 F6.1 pix lev1_Y SASS level 1 y coordinate (0.5arcsec/pixel) 256-260 F5.1 arcsec cirRadius Radius of source circle for source intensity measurement 261-267 I7 ct totCounts Total (source + background) counts within cirRadius 269-272 I4 ct e_totCounts Mean error on totCounts 274-277 I4 ct bkgCounts Background counts inside cirRadius 279-283 F5.3 --- QE 1keV Quantum Efficiency which has been used to derive CRate 285-289 F5.3 --- vig 1keV vignetting correction for source which has been used to derive CRate 291-295 F5.3 --- csc 1keV scattering correction for source which has been used to derive CRate 297-299 I3 arcsec Xsize X source detect cell size 301-303 I3 arcsec Ysize Y source detect cell size 305-311 I7 ct boxCounts Total counts in detection box 313-316 I4 ct thrCounts Threshold for detection at this location 318-321 F4.2 --- unresPr *[0,1] Probability the source is unresolved 323-328 F6.1 pix XposEC X position of extended circle (0.5arcsec/pix) 330-335 F6.1 pix YposEC Y position of extended circle (0.5arcsec/pix) 337-342 F6.1 arcsec RadEC Radius of the extended circle 345-350 F6.3 --- SctEC Extended circle scattering correction (truncated at 999.999) 352-359 F8.2 --- CorEC Extended circle size correction (truncated at 99999.99) 361-368 F8.2 --- e_CorEC Mean error on CorEC
Note on SeqDetec: Unique name for detection, based on the observation sequence id and the number of the detection in the source list for that sequence. Note on 1RXH, n_1RXH: this name follows IAU conventions (based on J2000 position). Note that this name is NOT UNIQUE, detections with the same position sharing the same detection name; such detections may or may not represent the same astrophysical source. The column n_1RXH, if not blank, gives the number of sources sharing the same 1RXH name (the n_1RXH column was added at CDS) Note on varFlag: Source variability flag from SASS: N = Negative T = Too few observations P = Possible Note on SRCflags: The dot (.) indicates the absence of the flag. c = CONFUSED (Close sources confused detection algorithm) d = DET_STRUCT (Source near detector structure) e = EXTENDED (Source extended, probably resolved) f = FALSE_DET (Detection of unreal or false source) i = INTEN_SUSP (Source brightness suspect) u = UN_UNIQUE (source matched with another source which was identified in a smaller detect cell) m = MULT_DET (Complex emission split into individual sources) n = NOT_CHECKED (Weak source below SNR threshold used for checking) p = POS_SUSP (Source position suspect) a = ASSOCIATED (another source nearby may influence derived source quantities) v = VARFLG_SUSP (Source variability indicator from SASS is suspect) w = WITHIN_EXT (Source within extended emission) Note on SEQflags: The dot (.) indicates the absence of the flag. D = DEFERRED (Field not flagged by operator) data screening not done A = ASP_SUSP (Aspect solution suspect) obvious aspect problems, sources appear multiple or have obvious ellipticity B = BKG_SUSP (Background suspect) Field background may be incorrect, due to inclusion of high background intervals or extended emission E = EXT_EMIS (Extended emission in field) presence of extended emission over most of the field F = FIELD_FDET (False detections in field) one or more detected sources deemed false M = SRC_MISS (Sources in field missed) S = SLIS_MIS (Source list missing) source list is missing, no sources detected by SASS or source detection stopped + = source is included in the Short Version, i.e. has the following flags not set (marked with a dot): SRCflags: f (FALSE_DET) n (NOT_CHECKED) u (UN_UNIQUE) SEQflags: D (DEFERRED) (the "+" flag was added at CDS) Note on EPI: The Edge Proximity Indicator indicates what fraction of the detect cell is corrupted by edges or hot spots; a zero means no edges or hot spots and 1.0 means complete obscuration. Note on unresPr: this number measures how well the radial distribution matches the expected probability function. A perfect match produces unresPr=1.0
Byte-by-byte Description of file: seq.dat
Bytes Format Units Label Explanations
1- 24 A24 --- DataFile ROSAT Data File 26- 29 A4 --- ChkSite Checker Site (AIP, GSFC, MPE or SAO) 31- 34 A4 --- ChkName Checker ID 36- 41 A6 "YYMMDD" ChkDate Date of sequence and source checking 43- 50 A8 --- ChkVers Checking version 52- 59 A8 --- SEQflags [.DABEFMS_] Sequence flags (see the "Note on SEQflags" section above) 61- 67 I7 s ExpTime Exposure live time 70- 75 A6 "YYMMDD" begDate Observation start date 77- 82 A6 "YYMMDD" endDate Observation finish date 84- 87 I4 --- Nsrc Number of sources 89- 91 I3 --- --- [0] 93-103 A11 --- error Reason for skipping the qsrc file 105-106 I2 --- unRRA [0] Number of RRA (ROSAT Result Archive) table columns which contain undefined values for any of the sources 108 I1 --- unkey1 [0] Number of undefined keywords from primary header 110-111 I2 --- unkey2 Number of undefined keywords from secondary header 113-115 I3 --- statSRCc Number of sources with flag 'c' (CONFUSED) 116-118 I3 --- statSRCd Number of sources with flag 'd' (DET_STRUCT) 119-121 I3 --- statSRCe Number of sources with flag 'e' (EXTENDED) 122-124 I3 --- statSRCf Number of sources with flag 'f' (FALSE_DET) 125-127 I3 --- statSRCi Number of sources with flag 'i' (INTEN_SUSP) 128-130 I3 --- statSRCu Number of sources with flag 'u' (UN_UNIQUE) 131-133 I3 --- --- [0] 134-136 I3 --- statSRCm Number of sources with flag 'm' (MULT_DET) 137-139 I3 --- statSRCn Number of sources with flag 'n' (NOT_CHECKED) 140-142 I3 --- statSRCp Number of sources with flag 'p' (POS_SUSP) 143-145 I3 --- statSRCa Number of sources with flag 'a' (ASSOCIATED) 146-148 I3 --- statSRCv Number of sources with flag 'v' (VARFLG_SUSP) 149-151 I3 --- statSRCw Number of sources with flag 'w' (WITHIN_EXT) 153-160 F8.4 deg RAdeg Pointing Right ascension (J2000) 162-169 F8.4 deg DEdeg Pointing Declination (J2000) 171-174 A4 --- Site Processing Site (MPE or USRS)
History: * 05-Nov-1999: The files corresponding to the 2nd Release were copied from on 22-Aug-1999. This ReadMe file is essentially made from the ROSAT documentation available at the ROSHRI Home Page ( The columns 'n_1RXH' (indication of sources with name collisions) and the SEQflag "+" (indicating a source belonging to the short sample) were added at CDS. * 05-May-2000: The files corresponding to the 3rd Release were copied from, after revision. The same procedure as made on 05-Nov-1999 was applied to the new files. * 22-Jul-2008: New ROSAT URL :
(End) Francois Ochsenbein [CDS] 03-May-2000
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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