PIGSSELCNF ivo://nasa.heasarc/pigsselcnf NASA/GSFC HEASARC Croft et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains results from a total of 459 repeated 3.1-GHz radio continuum observations (of which 379 were used in a search for transient sources) of the ELAIS-N1, Coma, Lockman Hole, and NOAO Deep Wide Field Survey (NDWFS) fields as part of the Allen Telescope Array (ATA) Pi GHz Sky Survey (PiGSS). The observations were taken in 2 simultaneous 100-MHz wide bands centered at 3.04 and 3.14 GHz approximately once per day between 2009 May and 2011 April. Each image covers 11.8 square degrees and has 100" FWHM resolution. Deep images for each of the four fields have rms noise between 180 and 310 µJy (µJy), and the corresponding catalogs contain ~200 sources in each field. Typically 40-50 of these sources are detected in each single-epoch image. This represents one of the shortest cadence, largest area, multi-epoch surveys undertaken at these frequencies. The authors compared the catalogs generated from the combined images to those from individual epochs, and from monthly averages, as well as to legacy surveys. They undertook a search for transients, with particular emphasis on excluding false positive sources,but find no confirmed transients, defined here as sources that can be shown to have varied by at least a factor of 10. However, the authors found one source that brightened in a single-epoch image to at least six times the upper limit from the corresponding deep image. They also found a source associated with a z = 0.6 quasar which appears to have brightened by a factor ~3 in one of their deep images, when compared to catalogs from legacy surveys. The authors place new upper limits on the number of transients brighter than 10 mJy: fewer than 0.08 transients deg<sup>-2</sup> with characteristic timescales of months to years; fewer than 0.02 deg<sup>-2</sup> with timescales of months; and fewer than 0.009 deg<sup>-2</sup> with timescales of days. In this study, the authors accepted only as real sources those that are independently detected in both frequencies in at least one epoch (with a position matching tolerance of 50", corresponding to a false match probability of <2%). Their threshold of ~ 4.2 sigma for detection in a single image corresponds to a threshold of ~ 5.9 sigma in the dual-image catalog. They generated catalogs for the deep fields, consisting only of sources detected at both frequencies, and these are contained in the present HEASARC table. Notice that the authors previously published a list of 425 radio sources in the NDWFS field in the constellation of Bootes in an earlier paper (Bower et al 2010, ApJ, 725, 1792, available as the HEASARC database table PIGSSBOOFD). In the 2013 paper, they have performed a partial re-analysis of these data to conform with the updated analysis techniques used on the other three fields. This table was created by the HEASARC in March 2013 based on electronic versions of Tables 2, 3, 4 and 5 (source lists for each of the 4 fields, ELAIS N1, Lockman, Coma, and NDWFS, respectively) from the reference paper which were obtained from the ApJ web site. The HEASARC has created a new parameter called field_name which identifies in which table/field the source can be found. Thus, to select only sources in the Lockman Hole field, the user should select field_name= 'Lockman'. This is a service provided by NASA HEASARC . 2013ApJ...762...93C https://heasarc.gsfc.nasa.gov/W3Browse/all/pigsselcnf.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=pigsselcnf& GET text/xml 180 99999 true 195.0474 26.39237 0.0833333333333333 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=pigsselcnf GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_pigsselcnf&Action=More+Options&Action=Parameter+Search&ConeAdd=1 RADIO CATALOG 0.0833333333333333 Radio public pigsselcnf Allen Telescope Array Pi GHz Sky Survey (PiGSS) Deep Fields Sour name PiGSS Source Identification meta.id;meta.main char nullable field_name Field Designation meta.id;obs.field char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable flux_3p04_ghz Deep Image 3.04-GHz Flux Density mJy phot.flux.density;em.radio.3-6GHz double nullable flux_3p04_ghz_error Uncertainty in Deep Image 3.04-GHz Flux Density mJy stat.error;phot.flux.density;em.radio.3-6GHz double nullable flux_3p14_ghz Deep Image 3.14-GHz Flux Density mJy phot.flux.density;em.radio.3-6GHz double nullable flux_3p14_ghz_error Uncertainty in Deep Image 3.14-GHz Flux Density mJy stat.error;phot.flux.density;em.radio.3-6GHz double nullable major_axis Measured Gaussian Major Axis arcsec phys.angSize.smajAxis double nullable bii Galactic Latitude degree pos.galactic.lat double nullable lii Galactic Longitude degree pos.galactic.lon double nullable sigma_to_mean_3p14_ghz Standard Deviation at 3.14 GHz stat.stdev;stat.mean;arith.ratio double nullable position_angle Measured Position Angle degree pos.posAng double nullable minor_axis Measured Gaussian Minor Axis arcsec phys.angSize.sminAxis double nullable reduced_chi2_3p04_ghz Reduced Chi^2 at 3.04 GHz stat.fit.chi2;src.var double nullable num_3p14_ghz_images Number of Single-Epoch S3140 Images meta.number short nullable num_both_freq_images Number of Single-Epoch Images at Both Frequencies meta.number short nullable num_3p04_ghz_images Number of Single-Epoch S3040 Images meta.number short nullable reduced_chi2_3p14_ghz Reduced Chi^2 at 3.14 GHz stat.fit.chi2;src.var double nullable sigma_to_mean_3p04_ghz Standard Deviation at 3.04 GHz stat.stdev;stat.mean;arith.ratio double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable