Summary of Data Quality Observations of 15/10/96 ----------------------------------------------- This report was generated on 22 October 1996 Array: 1.5A Fields: Calibrator 1934-638 Offset Calibrator 1934_a Blank Field 1934_b Frequencies: 1384 2368 4800 8640 MHz The offset calibrator field was offset in RA,DEC from 1934-638 by 0,420 arcsec at 1384 MHz 0,420 arcsec at 2368 MHz 0,120 arcsec at 4800 MHz 0,120 arcsec at 8640 MHz See the end of this document for an explanation of terms and the filenaming convention. See http://wwwnar.atnf.csiro.au/www/operations/dqo/dqo.html for information on the DQO program. Comments: First successful DQO run in several months. It is still hoped that we will be able to pull useful information out of other observation runs. Coincidentally, this is the first run back on 1934-638 after a period of using 0823-500 as the primary source for the observations. ======================================================================== Visibility-based statistics --------------------------- Total observing time is 9.99 hours Flagging statistics after ATLOD ------------------------------- File Overall CA01 CA02 CA03 CA04 CA05 CA06 ---- ------- ---- ---- ---- ---- ---- ---- 1934-638.1384 14.4% 13.5% 13.5% 14.9% 14.9% 14.9% 14.9% 1934-638.2368 7.8% 7.9% 7.8% 7.8% 7.8% 7.8% 7.8% 1934-638.4800 7.6% 6.5% 6.6% 8.3% 8.0% 8.0% 8.0% 1934-638.8640 8.1% 8.0% 8.1% 8.3% 8.1% 8.0% 8.0% 1934_a.1384 7.7% 7.7% 7.7% 7.7% 7.7% 7.7% 7.7% 1934_a.2368 0.1% 0.1% 0.1% 0.1% 0.3% 0.1% 0.1% 1934_a.4800 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 0.0% 1934_a.8640 0.4% 0.2% 0.6% 0.6% 0.2% 0.4% 0.2% 1934_b.1384 7.7% 7.7% 7.7% 7.7% 7.7% 7.7% 7.8% 1934_b.2368 0.3% 0.2% 0.5% 0.3% 0.2% 0.5% 0.3% 1934_b.4800 0.2% 0.1% 0.1% 0.1% 0.2% 0.1% 0.4% 1934_b.8640 0.1% 0.0% 0.0% 0.0% 0.0% 0.2% 0.0% ---------------------------------------------- Closure phase statistics for the point sources ---------------------------------------------- File Th.Phase Sigmas ---- -------- ------ 1934-638.1384 0.014 16.86 1934-638.2368 0.018 4.22 1934-638.4800 0.032 1.28 1934-638.8640 0.064 1.47 1934_a.1384 0.013 15.23 1934_a.2368 0.022 4.95 1934_a.4800 0.030 1.43 1934_a.8640 0.077 1.44 --------------------------------------- Post-reduction flagging statistics ---------------------------------- File Overall CA01 CA02 CA03 CA04 CA05 CA06 ---- ------- ---- ---- ---- ---- ---- ---- 1934-638.1384-cal 26.6% 26.2% 30.6% 23.2% 26.9% 26.3% 26.2% 1934-638.2368-cal 14.8% 17.4% 15.5% 14.2% 12.7% 14.5% 14.4% 1934-638.4800-cal 15.0% 15.7% 15.3% 14.3% 17.9% 13.5% 13.3% 1934-638.8640-cal 13.5% 12.8% 12.7% 13.6% 12.6% 13.7% 15.4% 1934_a.1384-cal 13.5% 14.9% 20.0% 8.7% 8.9% 13.5% 15.0% 1934_a.2368-cal 0.1% 0.1% 0.1% 0.1% 0.3% 0.1% 0.1% 1934_a.4800-cal 3.5% 3.3% 5.2% 5.0% 2.2% 3.6% 1.5% 1934_a.8640-cal 3.7% 3.0% 5.6% 2.4% 4.3% 3.3% 3.9% 1934_b.1384-cal 9.2% 9.1% 9.0% 9.1% 9.2% 9.2% 9.4% 1934_b.2368-cal 2.0% 1.8% 2.1% 2.2% 1.9% 2.1% 2.0% 1934_b.4800-cal 3.2% 3.5% 2.3% 2.2% 5.3% 2.1% 3.9% 1934_b.8640-cal 4.2% 4.4% 4.4% 3.0% 2.9% 5.5% 5.2% ======================================================================== Image-based statistics ---------------------- File Th. RMS Sigmas D.R. Pk Val ---- ------- ------ ---- ------ 1934-638.1384.icln 1.31E-04 9.03 12643 14.931 1934-638.1384.qmap 1.31E-04 7.76 0.006 1934-638.1384.umap 1.31E-04 8.48 0.006 1934-638.1384.vmap 1.31E-04 4.43 0.003 1934-638.2368.icln 1.37E-04 12.77 6619 11.569 1934-638.2368.qmap 1.37E-04 6.23 0.004 1934-638.2368.umap 1.37E-04 6.32 0.004 1934-638.2368.vmap 1.37E-04 4.84 0.003 1934-638.4800.icln 1.15E-04 6.30 8013 5.823 1934-638.4800.qmap 1.15E-04 2.06 0.001 1934-638.4800.umap 1.15E-04 2.17 0.001 1934-638.4800.vmap 1.15E-04 1.92 0.001 1934-638.8640.icln 1.20E-04 2.77 8500 2.834 1934-638.8640.qmap 1.20E-04 1.17 0.001 1934-638.8640.umap 1.20E-04 1.12 0.001 1934-638.8640.vmap 1.20E-04 1.45 0.001 1934_a.1384.icln 1.25E-04 16.35 6496 13.262 1934_a.1384.qmap 1.25E-04 8.29 10 0.010 1934_a.1384.umap 1.25E-04 8.59 0.006 1934_a.1384.vmap 1.25E-04 4.46 0.004 1934_a.2368.icln 1.28E-04 12.97 5144 8.545 1934_a.2368.qmap 1.28E-04 45.64 28 0.165 1934_a.2368.umap 1.28E-04 33.65 13 0.054 1934_a.2368.vmap 1.28E-04 29.45 18 0.068 1934_a.4800.icln 1.07E-04 6.99 7271 5.419 1934_a.4800.qmap 1.07E-04 3.13 22 0.007 1934_a.4800.umap 1.07E-04 2.27 0.001 1934_a.4800.vmap 1.07E-04 1.88 10 0.002 1934_a.8640.icln 1.13E-04 2.96 6963 2.317 1934_a.8640.qmap 1.13E-04 11.76 18 0.024 1934_a.8640.umap 1.13E-04 7.98 10 0.009 1934_a.8640.vmap 1.13E-04 12.55 13 0.018 1934_b.1384.imap 1.18E-04 6.84 22 0.018 1934_b.1384.qmap 1.18E-04 1.20 0.001 1934_b.1384.umap 1.18E-04 1.09 0.001 1934_b.1384.vmap 1.18E-04 1.00 0.001 1934_b.2368.imap 1.26E-04 1.91 15 0.004 1934_b.2368.qmap 1.26E-04 1.05 0.001 1934_b.2368.umap 1.26E-04 1.06 0.001 1934_b.2368.vmap 1.26E-04 0.98 0.001 1934_b.4800.imap 1.03E-04 1.10 0.001 1934_b.4800.qmap 1.03E-04 1.05 0.000 1934_b.4800.umap 1.03E-04 1.01 0.000 1934_b.4800.vmap 1.03E-04 1.03 0.000 1934_b.8640.imap 1.11E-04 1.12 0.001 1934_b.8640.qmap 1.11E-04 1.07 0.001 1934_b.8640.umap 1.11E-04 1.09 0.001 1934_b.8640.vmap 1.11E-04 1.05 0.001 ======================================================================== Explanation of Terms: --------------------- Th.Phase The theoretical closure phase (in degrees) based on thermal noise arguments (for the 5-minute time averaging used). Th. RMS The theoretical RMS in an image based on thermal noise arguments. Sigmas The factor by which the relevant measure exceeds either of the above two theoretical levels. Ideally this should be 1. D.R. Dynamic range of an image, defined as the ratio of the peak absolute value divided by the RMS. For the CLEANed Stokes-I images of the calibrators, the RMS is evaluated outside the inner quarter of the image. Otherwise the RMS is evaluated over the entire image. Pk Val Peak value in an image in Jy. Explanation of File names: -------------------------- File names are of the form FIELD.FREQ Raw visibility data, giving the field name and observing frequency. FIELD.FREQ-cal Calibrated/flagged visibility data. FIELD.FREQ.TYPE Image of a portion of the primary beam. TYPE gives the Stokes parameter and whether the image is CLEANed ("cln") or a dirty image ("map").