II/339 Swift/UVOT Serendipitous Source Catalog (Yershov, 2015) ================================================================================ Serendipitous UV source catalogues for 10 years of XMM and 5 years of Swift Yershov V.N. =2014Ap&SS.354...97Y The Swift UVOT Serendipitous Source Catalogue - UVOTSSC (2005-2010), Version 1 Page M., Yershov V., Breeveld A., Kuin N.P.M., Mignani R.P., Smith P.J., Rawlings J.I., Oates S.R., Siegel M., Roming P.W.A. =2015yCat.2339....0Y =2014styd.confE..37P (2015arXiv150306597P) ================================================================================ ADC_Keywords: Photometry, ultraviolet ; Photometry, UBV Mission_Name: Swift Description: The first version of the Swift UVOT serendipitous source catalogue (UVOTSSC) provides positions and magnitudes, as well as errors and upper limits of confirmed sources for observations taken from start of operations in 2005 until October 1st of 2010. The first version of the Swift UVOT Serendipitous Source Catalogue (UVOTSSC) has been produced by processing the image data obtained from the Swift Ultraviolet and Optical Telescope (UVOT) from the beginning of the mission (2005) until 1st of October of 2010. The data processing was performed at the Mullard Space Science Laboratory (MSSL, University College London, U.K.) using Swift FTOOLS from NASA's High Energy Astrophysics Software (HEASoft-6.11), with some customising of the UVOT packages in order to get more complete source detection and properly apply quality flags to those sources that were detected within the UVOT image artefacts. The total number of observations with 17'x17' images used for version 1 of the catalogue is 23,059, giving 6,200,016 sources in total, of which 2,027,265 have multiple entries in the source table because they have been detected in more than one observation. Some sources were only observed in one filter. The total number of entries in the source table is 13,860,568. The S/N ratio for all sources exceeds 5 for at least one UVOT filter, the rest of the filters having a S/N greater than 3. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file uvotssc1_1.fit 2880 1613850 Full catalogue containing Sources and Summary tables -------------------------------------------------------------------------------- Information on catalogue format and columns can be found in: uvotssc_brief_description_v1_1.pdf The data files are also available for download from MSSL/UCL in 4-hour wide sections in RA containing sources table and summary table (Fits version): uvotssc_00_v1.1.fit Sources table 0-4 hours in RA and Summary table uvotssc_04_v1.1.fit Sources table 4-8 hours in RA and Summary table uvotssc_08_v1.1.fit Sources table 8-12 hours in RA and Summary table uvotssc_12_v1.1.fit Sources table 12-16 hours in RA and Summary table uvotssc_16_v1.1.fit Sources table 16-20 hours in RA and Summary table uvotssc_20_v1.1.fit Sources table 20-24 hours in RA and Summary table The ASCII version, also in 4-hour wide sections in RA is available in a tar file: uvotssc1_1ascii.tar.gz uvotssc1_1ascii.tar.gz contains: uvotssc_00_v1.1.txt Ascii version of Sources table 0-4 hours in RA uvotssc_04_v1.1.txt uvotssc_08_v1.1.txt uvotssc_12_v1.1.txt uvotssc_16_v1.1.txt uvotssc_20_v1.1.txt uvotssc1_1_tab2.txt Ascii version of Summary table See also: J/ApJ/725/1215 : Faint UV standards from Swift, GALEX and SDSS (Siegel+, 2010) J/AJ/137/4517 : UVOT light curves of supernovae (Brown+, 2009) J/AJ/141/205 : UVOT imaging of M81 and Holmberg IX (Hoversten+, 2011) J/MNRAS/424/1636 : Swift/UVOT sources in NGC4321 (M100) (Ferreras+, 2012) J/other/ATel/5200 : VizieR Online Data Catalog: Swift Galactic Plane Survey: sourcelist v3 (Reynolds+, 2013) Byte-by-byte Description of SOURCES table -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 8 A8 --- --- [UVOTSSC1] 10- 26 A17 --- Name UVOTSSC1 name (JHHMMSS.s+DDMMSSa) (IAUNAME) 28- 32 I5 --- Oseq [1/23059] Reference number in the observation table (N_SUMMARY) 34- 44 I011 --- ObsID Unique Swift observation ID (OBSID) 46 I1 --- Nf [1/6] Number of filters included in this observation (NFILT) 48- 54 I7 --- SrcID [1/6200016] Unique source number (SRCNUM) 56- 65 F10.6 deg RAdeg Right ascension (J2000) (RA) (1) 67- 76 F10.6 deg DEdeg Declination (J2000) (DEC) (1) 78- 84 F7.3 arcsec e_RAdeg [0.001/15] Right ascension error (RA_ERR) (1) 86- 92 F7.3 arcsec e_DEdeg [0.001/21] Declination error (DEC_ERR) (1) 94- 99 F6.3 arcsec rUVW2 [0/30]? Distance to closest UVW2 source (UVW2_SRCDIST) 101-106 F6.3 arcsec rUVM2 [0/30]? Distance to closest UVM2 source (UVM2_SRCDIST) 108-113 F6.3 arcsec rUVW1 [0/30]? Distance to closest UVW1 source (UVW1_SRCDIST) 115-120 F6.3 arcsec rU [0/30]? Distance to closest U source (U_SRCDIST) 122-127 F6.3 arcsec rB [0/30]? Distance to closest B source (B_SRCDIST) 129-134 F6.3 arcsec rV [0/30]? Distance to closest V source (V_SRCDIST) 136-138 I3 --- Nd [1/208] Number of individual observations (N_OBSID) (2) 140-145 F6.1 --- sUVW2 [3/5813]? Significance (S/N) in UVW2 (UVW2_SIGNIF) 147-152 F6.1 --- sUVM2 [3/5000]? Significance (S/N) in UVM2 (UVM2_SIGNIF) 154-159 F6.1 --- sUVW1 [3/5000]? Significance (S/N) in UVW1 (UVW1_SIGNIF) 161-166 F6.1 --- sU [3/5000]? Significance (S/N) in U (U_SIGNIF) 168-173 F6.1 --- sB [3/5000]? Significance (S/N) in B (B_SIGNIF) 175-180 F6.1 --- sV [3/5000]? Significance (S/N) in V (V_SIGNIF) 182-188 F7.4 mag UVW2 ? UVOT/UVW2 Vega magnitude (UVW2_VEGAMAG) (3) 190-196 F7.4 mag UVM2 ? UVOT/UVM2 Vega magnitude (UVM2_VEGAMAG) (3) 198-204 F7.4 mag UVW1 ? UVOT/UVW1 Vega magnitude (UVW1_VEGAMAG) (3) 206-212 F7.4 mag Umag ? UVOT/U Vega magnitude (U_VEGAMAG) (3) 214-220 F7.4 mag Bmag ? UVOT/N Vega magnitude (B_VEGAMAG) (3) 222-228 F7.4 mag Vmag ? UVOT/V Vega magnitude (V_VEGAMAG) (3) 230-236 F7.4 mag UVW2-AB ? UVOT/UVW2 AB magnitude (UVW2_ABMAG) (3) 238-244 F7.4 mag UVM2-AB ? UVOT/UVM2 AB magnitude (UVM2_ABMAG) (3) 246-252 F7.4 mag UVW1-AB ? UVOT/UVW1 AB magnitude (UVW1_ABMAG) (3) 254-260 F7.4 mag U-AB ? UVOT/U AB magnitude (U_ABMAG) (3) 262-268 F7.4 mag B-AB ? UVOT/B AB magnitude (B_ABMAG) (3) 270-276 F7.4 mag V-AB ? UVOT/V AB magnitude (V_ABMAG) (3) 278-283 F6.4 mag e_UVW2 ? Error on UVW2 magnitude (UVW2_MAG_ERR) 285-290 F6.4 mag e_UVM2 ? Error on UVM2 magnitude (UVM2_MAG_ERR) 292-297 F6.4 mag e_UVW1 ? Error on UVW2 magnitude (UVW1_MAG_ERR) 299-304 F6.4 mag e_Umag ? Error on U magnitude (U_MAG_ERR) 306-311 F6.4 mag e_Bmag ? Error on B magnitude (B_MAG_ERR) 313-318 F6.4 mag e_Vmag ? Error on V magnitude (V_MAG_ERR) 320-331 E12.6 cW/m2/nm F.UVW2 ? UVOT/UVW2 Flux (UVW2_FLUX) (3) 333-344 E12.6 cW/m2/nm F.UVM2 ? UVOT/UVW2 Flux (UVM2_FLUX) (3) 346-357 E12.6 cW/m2/nm F.UVW1 ? UVOT/UVW2 Flux (UVW1_FLUX) (3) 359-370 E12.6 cW/m2/nm F.U ? UVOT/UVW2 Flux (U_FLUX) (3) 372-383 E12.6 cW/m2/nm F.B ? UVOT/UVW2 Flux (B_FLUX) (3) 385-396 E12.6 cW/m2/nm F.V ? UVOT/UVW2 Flux (V_FLUX) (3) 398-407 E10.4 cW/m2/nm e_F.UVW2 ? Error on F.UVW2 (UVW2_FLUX_ERR) 409-418 E10.4 cW/m2/nm e_F.UVM2 ? Error on F.UVM2 (UVM2_FLUX_ERR) 420-429 E10.4 cW/m2/nm e_F.UVW1 ? Error on F.UVW1 (UVW1_FLUX_ERR) 431-440 E10.4 cW/m2/nm e_F.U ? Error on F.U (U_FLUX_ERR) 442-451 E10.4 cW/m2/nm e_F.B ? Error on F.B (B_FLUX_ERR) 453-462 E10.4 cW/m2/nm e_F.V ? Error on F.V (V_FLUX_ERR) 464-469 F6.3 arcsec aUVW2 ? Major axis in UVW2 (UVW2_MAJOR) 471-476 F6.3 arcsec aUVM2 ? Major axis in UVM2 (UVM2_MAJOR) 478-483 F6.3 arcsec aUVW1 ? Major axis in UVW1 (UVW1_MAJOR) 485-490 F6.3 arcsec aU ? Major axis in U (U_MAJOR) 492-497 F6.3 arcsec aB ? Major axis in B (B_MAJOR) 499-504 F6.3 arcsec aV ? Major axis in V (V_MAJOR) 506-511 F6.3 arcsec bUVW2 ? Minor axis in UVW2 (UVW2_MINOR) 513-518 F6.3 arcsec bUVM2 ? Minor axis in UVM2 (UVM2_MINOR) 520-525 F6.3 arcsec bUVW1 ? Minor axis in UVW1 (UVW1_MINOR) 527-532 F6.3 arcsec bU ? Minor axis in U (U_MINOR) 534-539 F6.3 arcsec bB ? Minor axis in B (B_MINOR) 541-546 F6.3 arcsec bV ? Minor axis in V (V_MINOR) 548-552 F5.2 deg paUVW2 [0/90]? Position angle of major axis in UVW2 (UVW2_POSANG) 554-558 F5.2 deg paUVM2 [0/90]? Position angle of major axis in UVM2 (UVM2_POSANG) 560-564 F5.2 deg paUVW1 [0/90]? Position angle of major axis in UVW1 (UVW1_POSANG) 566-570 F5.2 deg paU [0/90]? Position angle of major axis in U (U_POSANG) 572-576 F5.2 deg paB [0/90]? Position angle of major axis in B (B_POSANG) 578-582 F5.2 deg paV [0/90]? Position angle of major axis in V (V_POSANG) 584 I1 --- xUVW2 [0/1] Extended flag in UVW2 (UVW2_EXTENDED) 586 I1 --- xUVM2 [0/1] Extended flag in UVW2 (UVM2_EXTENDED) 588 I1 --- xUVW1 [0/1] Extended flag in UVW2 (UVW1_EXTENDED) 590 I1 --- xU [0/1] Extended flag in UVW2 (U_EXTENDED) 592 I1 --- xB [0/1] Extended flag in UVW2 (B_EXTENDED) 594 I1 --- xV [0/1] Extended flag in UVW2 (V_EXTENDED) 596-598 I3 --- fUVW2 [0/511]?=- Quality flags in UVW2 (UVW2_QUALITY_FLAG) (4) 600-602 I3 --- fUVM2 [0/511]?=- Quality flags in UVM2 (UVM2_QUALITY_FLAG) (4) 604-606 I3 --- fUVW1 [0/511]?=- Quality flags in UVW1 (UVW1_QUALITY_FLAG) (4) 608-610 I3 --- fU [0/511]?=- Quality flags in U (U_QUALITY_FLAG) 612-614 I3 --- fB [0/511]?=- Quality flags in B (B_QUALITY_FLAG) 616-618 I3 --- fV [0/511]?=- Quality flags in V (V_QUALITY_FLAG) -------------------------------------------------------------------------------- Note (1): standard error of position in RA and Dec, i.e. (1/n)sqrt({Sigma}err) Note (2): this number should correspond to the number of entries for that particular source in the table. Note (3): Fluxes are expressed in erg/cm^2/s/Angstrom. The fluxes were derived using the count rate to flux conversion factors from Poole et al. (2008MNRAS.383..627P) which have been based on GRB spectra. This differs slightly from the count rate to flux conversion factor based on Pickles star spectra expressed as a flux ratio (rightmost column); note that the flux conversion factors are valid for UVOT B-V > -0.36 ------------------------------------------------ Filter Central Wavelength FWHM F.filter (nm) (nm) (Pickles/grb) ------------------------------------------------ V 546.8 76.9 0.998 B 439.2 97.5 0.893 U 346.5 78.5 0.940 UVW1 260.0 69.3 0.963 UVM2 224.6 49.8 0.884 UVW2 192.8 65.7 0.965 ------------------------------------------------ The UVOT UV filters are physically similar to those in XMM-OM but have greater throughput. The UVOT U,B,V are not the Johnson U,B,V passbands. Note (4): Quality flags are; 1 = Cosmetic defects (BAD PIXELS) within the source region 2 = Source on a READOUT STREAK 4 = Source on a "SMOKE RING" 8 = Source on a DIFFRACTION SPIKE 16 = Source affected by MOD-8 noise pattern 32 = Source within a "HALO RING" 64 = Source near to a BRIGHT source 128 = MULTIPLE EXPOSURE values within photometry aperture 256 = Source within an EXTENDED FEATURE Multiple flags are summed to give the final quality flag value. -------------------------------------------------------------------------------- Byte-by-byte Description of SUMMARY table -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 5 I5 --- Oseq [1/23059] Reference number (N_SUMMARY) 7- 17 I011 --- ObsID Unique Swift observation ID (OBSID) (5) 19- 36 A18 --- Target Swift original target identifier (TARGET_ID) 38- 57 A20 --- Filters List of filters used this OBSID (FILTERS) 59- 77 A19 "datime" StartDate Earliest observation date and time, UT format (DATE_MIN) 79- 88 F10.6 deg ptRAdeg Pointing RA (ICRS) of image centre (RA_PNT) 90- 99 F10.6 deg ptDEdeg Pointing Dec (ICRS) of image centre (DEC_PNT) 101-105 F5.1 deg ptPA [0/360] Position angle image centre (PA_PNT) 107-113 F7.1 s exp.UVW2 ?Total exposure time in UVW2 (EXP_UVW2) 115-121 F7.1 s exp.UVM2 ?Total exposure time in UVM2 (EXP_UVM2) 123-129 F7.1 s exp.UVW1 ?Total exposure time in UVW1(EXP_UVW1) 131-137 F7.1 s exp.U ?Total exposure time in U (EXP_U) 139-145 F7.1 s exp.B ?Total exposure time in B(EXP_B) 147-153 F7.1 s exp.V ?Total exposure time in V (EXP_V) 155-158 I4 --- n.UVW2 ?Number of UVW2 sources (NSOURCES_UVW2) 160-163 I4 --- n.UVM2 ?Number of UVM2 sources (NSOURCES_UVM2) 165-168 I4 --- n.UVW1 ?Number of UVW1 sources (NSOURCES_UVW1) 170-173 I4 --- n.U ?Number of U sources (NSOURCES_U) 175-178 I4 --- n.B ?Number of B sources (NSOURCES_B) 180-184 I5 --- n.V ?Number of V sources (NSOURCES_V) 186-191 F6.3 mag ul.UVW2 ?Limiting mag UVW2 (VEGAMAG_LIM_UVW2) (6) 193-198 F6.3 mag ul.UVM2 ?Limiting mag UVM2 (VEGAMAG_LIM_UVM2) (6) 200-205 F6.3 mag ul.UVW1 ?Limiting mag UVW1 (VEGAMAG_LIM_UVW1) (6) 207-212 F6.3 mag ul.U ?Limiting mag U (VEGAMAG_LIM_U) (6) 214-219 F6.3 mag ul.B ?Limiting mag B (VEGAMAG_LIM_B) (6) 221-226 F6.3 mag ul.V ?Limiting mag V (VEGAMAG_LIM_V) (6) 228-233 F6.3 mag ul.UVW2-AB ?Limiting AB-mag UVW2 (ABMAG_LIM_UVW2) (6) 235-240 F6.3 mag ul.UVM2-AB ?Limiting AB-mag UVM2 (ABMAG_LIM_UVM2) (6) 242-247 F6.3 mag ul.UVW1-AB ?Limiting AB-mag UVW1 (ABMAG_LIM_UVW1) (6) 249-254 F6.3 mag ul.U-AB ?Limiting AB-mag U (ABMAG_LIM_U) (6) 256-261 F6.3 mag ul.B-AB ?Limiting AB-mag B (ABMAG_LIM_B) (6) 263-268 F6.3 mag ul.V-AB ?Limiting AB-mag V (ABMAG_LIM_V) (6) -------------------------------------------------------------------------------- Note (5): One Swift OBSID can consist of one or more images, which for this catalogue have been summed, yielding the quoted total exposure time. The original uvot images can be found in the on-line archives at MAST, the Swift archive at swift.ac.uk and swift.gsfc.nasa.gov using the OBSID as search key. For higher temporal resolution the original images need to be used because the catalogue data sum over all images within an OBSID. Note (6): The upper limits per filter of the summed image constructed for each OBSID because the sensitivity hardly varies over the detector. Usually the images within one OBSID share the same pointing, however, whereas the quoted upper limits apply always for sources near the pointing direction given, if the images had small offsets in pointing they may not apply to sources near the edge of the summed image, which is typically about 8 arc seconds from the pointing. -------------------------------------------------------------------------------- History and notes: The initially released version of the catalogue (2015) was done with the source identifier "SWIFTUVOT" for each source, and was made available in that form. The decision was made to rename the catalogue sources by including the catalogue version number. In addition, in a few instances multiple SOURCE IDs shared the same IAU NAME. They will be distinghuished by having a letter a,b,c,..etc. appended to their NAME. Sources brighter than 0.96 counts per frame have not been included. Their coincidence loss is too large to correct for. ================================================================================ (End) Paul Kuin [MSSL/UCL], Francois Ochsenbein [CDS] 27-November-2015