EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment N10M1. If you have any comments on this experiment please email the address below.
A detailed description of the pipeline output is available.

Last updated: Mon Oct 11 18:04:02 CEST 2010 muehle@jive.nl

General Comments. ( Brief data summary and scan listing )
5cm band (6 GHz) network monitoring experiment (NME) observed on 10 March 2010. The data rate was 512 Mbps (8 x 8 MHz subbands, dual polarization, two-bit sampling). The experiment consisted of long scans on the calibrator sources '3C84', 'DA193', and '4C39.25' as well as a fast-phase referencing part with 'J0612+4122' as the target and 'DA193' as the phase-reference source. In this pipeline reduction, Ef, Ys and On served as reference antennas and Ef was the plot reference, i.e. baselines to Ef are plotted.
10+1 stations participated in the experiment: Cm, Ef, Jb2, On, Mc, Nt, Sh, Tr, Ys and Wb. Data from Kn were recorded on the spare tracks of the Cm disk pack. In the ftp fringe test, there were fringes to all stations and in all subbands (Cm, Kn: subbands 4+5 = IFs 5+6), except for Mc/subbands 0+1/RCP (BBC02). Unfortunately, disk 4 of the disk pack that contained the data of Cm and Kn had an uncoverable error, resulting in a complete loss of the two stations in the disk-based correlation. At Westerbork, subband 7 was missing because of a not properly initialized TAAM board. The problem was fixed by resetting the backend at 12:56-13:23 UT. Mc had a problem with BBC02, resulting in bad data in subbands 0+1/RCP. Nt missed scans 4+5 and showed very noisy phases and fast phase rotation.

The EVN reliability indicator (ERI) for this experiment was ERI = 0.74 . ERI* = 0.74 . (Cm=0, Ef=1, Jb=1, On=1, Mc=0.88, Nt=0.93, Sh=1, Tr=1, Ys=1, Wb=0.86)

Plots of the autocorrelations
Comments.
in general, bandpasses seem to be stable; Nt: weird bandpass in IF6/LCP; Tr: bandpass changes in IF5/LCP and IF6/LCP at 14:26 UT; 64 pages

plots of the uncalibrated amplitude and phase against time
Comments.
except for Nt and occasional glitches, phases can be followed easily on all baselines; generally stable amplitudes; Tr: low amplitude and bad phases in IF6/LCP at 14:26-15:35UT; Wb: bad amplitude and phase in IF8/LCP and IF8/LCP until backend was reset at 13:23 UT; Mc: low amplitude and bad phases in IF1/RCP and IF2/RCP (= BBC02) throughout the entire experiment; 32 pages

Plots of the uncalibrated amplitude and phase against frequency channel
Comments.
in general, phases look good, even uncalibrated, and bandpasses seem to be roughly stable; Wb: low amplitude and bad phases in IF8/RCP and IF8/LCP until backend reset (13:23 UT); Mc: low amplitude and chaotic phases in IF1/RCP and IF2/RCP (= BBC02); Tr: low amplitude and bad phases in IF5/LCP and IF6/LCP at 14:26-15:20 UT; 64 pages

The uncalibrated amplitude and phase of the crosshand correlations against frequency channel
Comments.
phases looking good, except for problems in Wb and Mc already mentioned above; 32 pages

TSYS against time
Comments.
Jb: T_sys of first scan unusually high in RCP channels (200-250K); On, Sh: a few outliers in densely sampled curve; Tr: T_sys values missing for IF5/LCP and IF6/LCP at 14:25-15:30 UT; 18 pages

Telescope sensitivities from the a priori TSYS and Gain curves (the square of this number gives the antenna noise (SEFD) in Jy - the smaller the better).
Comments.
mimic curves of T_sys; 15 pages

Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.
refant = Ef; Wb: bad solutions for IF8/RCP and IF8/LCP until backend reset (13:23 UT); Mc: no or bad solutions for IF1/RCP and IF2/RCP (= BBC02); Nt: very fast fringe rates in all IFs and polarizations; Tr: no solutions for IF5/LCP and IF6/LCP at 14:30-15:30 UT; 15 pages

Fringe-fit delay solutions
Comments.
refant = Ef; delays of the order of (a few tens of) nanoseconds; Wb: huge delays (~1 microsecond) in IF8/RCP and IF8/LCP until backend reset (13:23 UT); Mc: huge delays (~1 microsecond) in IF1/RCP and IF2/RCP (= BBC02); Tr: no solutions for IF5/LCP and IF6/LCP at 14:30-15:30 UT; Sh: a few outliers; 15 pages

Fringe-fit rate solutions
Comments.
refant = Ef; rates of the order of mHz, Wb: huge rates (~200mHz) in IF8/RCP and IF8/LCP until backend reset (13:23 UT); Mc: no or huge rates for IF1/RCP and IF2/RCP (= BBC02); Tr: no rates for IF5/LCP and IF6/LCP at 14:30-15:30 UT; 15 pages

Telescope bandpasses
Comments.
refant = Ef; amplitudes generally very close to 1.0; phases generally very close to zero, except at the edges of the bandpasses of Wb, Nt, Tr, Ys and Sh; Mc: noisy phases and strong edge drop-off in IF1/RCP and IF2/RCP (= BBC02); Nt: IF7/LCP and IF8/LCP missing; 2 pages

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
except for the phases of Nt and a few brief glitches at individual stations, stable amplitudes and phases; phases aligned close to zero; Wb: bad data in IF8/RCP and IF8/LCP until backend reset (13:23 UT); Tr: no data for IF5/LCP and IF6/LCP at 14:30-15:30 UT; Nt: IF7/LCP and IF8/LCP missing; Mc: bad data in IF1/RCP and IF2/RCP (= BBC02); 32 pages

Calibrated amplitude and phase against frequency channel
Comments.
phases of the calibrators in general close to zero, except for Nt and the problems already mentioned above; 64 pages

Naturally weighted dirty map (not useful for bright sources) produced before self-cal of:
4C39.25: pdf (not available) , or FITS (not available) .
3C84: pdf (not available) , or FITS (not available) .
J0612+4122: pdf , or FITS .
DA193: pdf (not available) , or FITS (not available) .
Comments.

Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
4C39.25: pdf (not available) , or FITS (not available) .
3C84: pdf (not available) , or FITS (not available) .
J0612+4122: pdf , or FITS .
DA193: pdf (not available) , or FITS (not available) .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
4C39.25 .
3C84 .
J0612+4122 (not available) .
DA193 .
Comments.
refant = Ef; except for Nt, phase corrections of the order of degrees; a few outliers; Mc: almost no solutions for IF1/RCP and IF2/RCP (= BBC02); Nt: no solutions at 12:26-12:47 UT (missed scans); Sh: few solutions for 3C84 in IF1/RCP and IF2/RCP; 14-15 pages per source

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
4C39.25: pdf , or text file , or statistical summary .
3C84: pdf , or text file , or statistical summary .
J0612+4122: pdf (not available) , or text file (not available) , or statistical summary (not available) .
DA193: pdf , or text file , or statistical summary .
Comments.
Wb: no/bad calibration for IF8/RCP and IF8/LCP for 3C84 (prior to backend reset); Mc: no/bad calibration for IF1/RCP and IF2/RCP (= BBC02); a few outliers; 14-15 pages per calibrator source

Telescope sensitivities (the total AMP gain applied during both a priori and self calibration; the square of this number gives the antenna noise (SEFD) in Jy).
Comments.
Nt: rapidly varying sensitivity in all IFs and polarizations, except during phase-referencing part; 15 pages

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
4C39.25 .
3C84 .
J0612+4122 (not available) .
DA193 .
Comments.
residual closure phases generally small, except for some loops of 3C84; some outliers; 17 pages per source

Calibrated visibilities and the source model of:
4C39.25 .
3C84 .
J0612+4122 (not available) .
DA193 .
Comments.
except for Nt and the problems mentioned above, generally very good agreement between models and data; 32 pages per source

Calibrated visibilities against u,v distance for:
4C39.25: pdf , or png .
3C84: pdf , or png .
J0612+4122: pdf , or png .
DA193: pdf , or png .
Comments.

u,v coverage for:
4C39.25: pdf , or png .
3C84: pdf , or png .
J0612+4122: pdf , or png .
DA193: pdf , or png .
Comments.

Crude maps of sources:
4C39.25: pdf , or FITS .
3C84: pdf , or FITS .
J0612+4122: pdf , or FITS .
DA193: pdf , or FITS .
Comments.