EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment GA021. 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 Jan 25 11:11:43 CET 2005 biggs@jive.nl

General Comments. ( Brief data summary and scan listing )
This is a Global VLBI imaging experiment at 6cm (LCP, 4 IFs). Particpating EVN stations were Ef, Jb, Nt, Tr, Wb and On. The reference antenna for calibration and plotting was Hn. The EVN reliability indicator was ERI=0.31 (Ef=0.80, Jb=0.00, Nt=0.00, Tr=0.90, Wb=0.90, On=1.00). ERI gives you an estimate of the ratio of observed/good visibilities to the expected number. ERI* is the same, but excludes data lost due to circumstances out of the EVN's control e.g. bad weather (ERI*=0.31).

Plots of the autocorrelations .
Comments.
None.

Plots of the uncalibrated amplitude and phase against time .
Comments.
Bad data visible on some telescopes; particularly of note are Wb (no data for last hour, probably due to hour angle limites of telescope) and Ef (large parts of the second half of the experiment are dead).

Plots of the uncalibrated amplitude and phase against frequency channel .
Comments.
None.

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

TSYS against time .
Comments.
None.

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.
All telescopes have close to the predicted sensitivity as given in the EVN Status Table).

Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.
Ef: variation reflects parallactic angle.

Fringe-fit delay solutions .
Comments.
None.

Fringe-fit rate solutions .
Comments.
None.

Telescope bandpasses .
Comments.
None.

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Data look pretty good apart from last scan of DA193 to Torun. Amplitude looks very low (source probably setting).
Other bits of bad data exist, additional flagging will probably clear this up.

Calibrated amplitude and phase against frequency channel .
Comments.
None.

Naturally weighted dirty map produced before self-cal of:
DA193: postscript , or FITS .
J1044+5322: postscript , or FITS .
Comments.
None.

Uniformly weighted dirty map produced before self-cal of:
DA193: postscript , or FITS .
J1044+5322: postscript , or FITS .
Comments.
None.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
DA193.
J1044+5322.
Comments.
Large corrections for first scan of DA193 as reference antenna (Hn) isn't present for the end of this.

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
DA193: postscript , or text file .
J1044+5322: postscript , or text file .
Comments.
In general, the amplitude calibration seems to have been good.
Tr: amplitudes are corrected downwards by 20%.
On: last scan of DA193 has large corrections and phase reference solutions show an "interesting" modulation.

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.
Wb in particular shows high solutions interpolated. These are probably due to bad data at the beginning of scans; Wb does not provide flagging information for when the antennas are on and off source. More flagging (QUACK) will fix this.

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
DA193 .
J1044+5322 .
Comments.
Bad data makes plots hard to read, but where the scales are sensible the data look fine.

Calibrated visibilities and the source model of:
DA193 .
J1044+5322 .
Comments.
Beginning of scan bad data on Wb is obvious.

Calibrated visibilities against u,v distance for:
DA193. postscript , or png (smaller)
J1044+5322. postscript , or png (smaller)
Comments.
Bad data is particularly obvious on DA193.

u,v coverage for:
DA193. postscript , or png (smaller)
J1044+5322. postscript , or png (smaller)
Comments.
None.

DA193: postscript , or FITS .
J1044+5322: postscript , or FITS .
Comments.
Source is detected at the centre of each map. Phase reference source appears resolved.