EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment GV020D_1. If you have any comments on this experiment please email the address below.
A detailed description of the pipeline output is available.


Last updated: Tue Feb 8 18:12:59 CET 2011 campbell@jive.nl


General Comments. ( Brief data summary and scan listing )
GV020D had 7 stations (Ar out), 8 16MHz IFs, and two polarizations, with 128 frequency points per IF and 0.5s integrations. It had 6 correlation passes, with the only difference being the name/coordinates of the "target" scans in each pass. Considerably more information is included in the experiment's cover letter on the standard-plots portion of the EVN Archive. The UVDATA were UVAVG'ed to 1s from 0.5s. In the pipelining, the target source was treated as phase-referenced sources and not directly fringed. The SOLINT was set automatically at a representative length of a reference-source scan in a phase-reference cycle. Ef & Gb were used as the reference stations.

The EVN reliability indicator (ERI) for this experiment was ERI = 0.581 . ERI* = 0.665 . The ERI was 0.581 The losses include Ar missing the whole experiment and Tr IF7-8/LCP having no fringes (i.e., counted as 7/8 of a station). The ERI, but not the ERI*, also counts losses due to the weather at On (winds forcing it to start ~1hr late) and the bad RFI for everyone in the upper half of IF2 and IF1 for Mc (treating RFI effects as "weather-like" loss rather than a station problem). These frequency-point ranges were channel-flagged in the course of the pipelining. Only EVN stations contributed to the ERI calculation (no consideration for Gb).


Plots of the autocorrelations
Comments.
Each scan plotted separately, all stations -- for some reason this plot refuses to make itself in this run (also as for gv020b-c) Later POSSMs of the cross-correlations seem fine.


plots of the uncalibrated amplitude and phase against time
Comments.
Full-experiment for Ef-* baselines, no calibration applied. A 2 minute plot-averaging was used.


Plots of the uncalibrated amplitude and phase against frequency channel
Comments.
Scalar averaged Ef-* baselines, each scan plotted separately. No calibration applied yet.


The uncalibrated amplitude and phase of the crosshand correlations against frequency channel (not available)
Comments.


TSYS against time
Comments.
TY1 table, each IF/pol on a separate plot.


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.
Gain amplitude from CL2 table.


Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.
CL3 station phase solutions -- CL3 = CL2+SN2, thus also includes the initial amplitude/parallactic angle calibration from CL2 and the fringe solutions from SN2. Wb,On,Gb have instances of most likely incorrect phase-connection choices (no SN-table editing/smoothing in automated pipeline).


Fringe-fit delay solutions
Comments.
SN2 station delay solutions for the fringed sources, each IF/pol on a separate plot. Outliers in lower IFs and a point just after 2200 for Wb in most IF/pols. For this experiment, one lag corresponds to 1/32 microsecond of delay.


Fringe-fit rate solutions
Comments.
SN2 station rate solutions. Similar outliers for Wb as for delay, plus as couple points in On also just after 2200.


Telescope bandpasses
Comments.
Bandpass table 1. J2139+1423 was used for bandpass calibration.


Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Full-experiment for Ef-* baselines, calibrated with CL3. The 2-min plot-averaging still applied.


Calibrated amplitude and phase against frequency channel
Comments.
Ef-* baselines calibrated with CL3 and BP1. The amp and phase plots self-scale, not necessarily going down to 0 in the case of the amps.


Naturally weighted dirty map (not useful for bright sources) produced before self-cal of:
J2139+1423: pdf (not available) , or FITS (not available) .
M15PSRC: pdf , or FITS .
3C454.3: pdf (not available) , or FITS (not available) .
Comments.
Naturually weighted dirty map of the target.


Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
J2139+1423: pdf (not available) , or FITS (not available) .
M15PSRC: pdf , or FITS .
3C454.3: pdf (not available) , or FITS (not available) .
Comments.
Uniformly weighted dirty map of the target.


Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
J2139+1423 .
M15PSRC (not available) .
3C454.3 .
Comments.
Plots of post-SPLIT tables SN1 for the sources that have been individually fringed.


Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
J2139+1423: pdf , or text file , or statistical summary .
M15PSRC: pdf (not available) , or text file (not available) , or statistical summary (not available) .
3C454.3: pdf , or text file , or statistical summary .
Comments.
As above, but for the post-SPLIT table SN2.


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.
CL4 gain-amp.


Residual closure phase (visibility closure phase with model closure phase subtracted) for:
J2139+1423 .
M15PSRC (not available) .
3C454.3 .
Comments.
Separate files per (fringed) source, showing closure phase plots for all the triangles (not just Ef-*-*). Only stokes=I shown.


Calibrated visibilities and the source model of:
J2139+1423 .
M15PSRC (not available) .
3C454.3 .
Comments.
For each (fringed) source, plots of amp/phase on Ef-* baselines, calibrated with (post-SPLIT) table CL3, with a model-line overplotted.


Calibrated visibilities against u,v distance for:
J2139+1423: pdf , or png .
M15PSRC: pdf , or png .
3C454.3: pdf , or png .
Comments.
For each source, a plot of amp vs. |uv| distance.


u,v coverage for:
J2139+1423: pdf , or png .
M15PSRC: pdf , or png .
3C454.3: pdf , or png .
Comments.
For each source, a plot of the u-v coverage.


Crude maps of sources:
J2139+1423: pdf , or FITS .
M15PSRC: pdf , or FITS .
3C454.3: pdf , or FITS .
Comments.
For each source, a CLEAN map resulting from the automated fringing and self-cal iterations (or phase-referencing) in the pipeline script.