EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment GJ010A_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: Thu Jun 24 09:16:44 CEST 2004 biggs@jive.nl

General Comments. ( Brief data summary and scan listing )
This is a global VLBI imaging experiment at 6cm (LCP only, 4 IFs). Scheduled stations were Ef, Mc, Nt, On, Jb (Mark2), Wb (tied array) and Tr. Non-EVN stations were the ten antennas of the VLBA plus a single antenna of the VLA. No stations failed outright. The reference antennas for calibration were Ef and Nl with Ef used for the plotting reference. Data that does not include Ef will not be plotted! This pass of the pipeline corresponds to source B0128+437! The EVN reliability indicator was ERI=0.99 (Ef=1.0,Mc=1.0,Nt=0.98,On=1.0,Jb=1.0,Wb=1.0,Tr=0.99). ERI gives you an estimate of the ratio of the 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*=0.99).

Plots of the autocorrelations .
Comments.
No signs of rfi in any channels.

Plots of the uncalibrated amplitude and phase against time .
Comments.
Data is present for every antenna in every channel.
Wb: finishes early due to hour angle limits.

Plots of the uncalibrated amplitude and phase against frequency channel .
Comments.
Jb, Fd: missing from 2007+777 plots.

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

TSYS against time .
Comments.
On, Mc: too many Tsys points are delivered for AIPS to handle. The antab file was modified for these antennas, every third point being retained.

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 antennas have close to the expected sensitivity. Tr shows worrying variations though, probably due to a bad gain curve.

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

Fringe-fit delay solutions .
Comments.
None.

Fringe-fit rate solutions .
Comments.
None.

Telescope bandpasses .
Comments.
Wb: phase solutions are large as always.

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Some bad data still needs to be flagged, probably at the beginning of scans.

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

Naturally weighted dirty map produced before self-cal of:
0552+398: postscript , or FITS .
2007+777: postscript , or FITS .
P0128: postscript , or FITS .
Comments.
None.

Uniformly weighted dirty map produced before self-cal of:
0552+398: postscript , or FITS .
2007+777: postscript , or FITS .
P0128: postscript , or FITS .
Comments.
None.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
0552+398.
2007+777.
P0128.
Comments.
2007+777: first solution is not good.
P0128: some dodgy solutions. Possible problems with the reference antenna in IF3 at 0/16.30 (VLBA antennas).

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
0552+398: postscript , or text file .
2007+777: postscript , or text file .
P0128: postscript , or text file .
Comments.
0552+398: 20% downward corrections in all subbands for Tr.
2007+777: corrections for EVN antennas are much bigger than for the VLA and generally down. P0128: clearly there are huge problems with the Tr gain curve (seen in other recent EVN experiments).

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.
Tr: curve is now much flatter.

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
0552+398 .
2007+777 .
P0128 .
Comments.
2007+777: Wb triangles are very noisy at the beginning.
P0128: data needing flagged is obvious.

Calibrated visibilities and the source model of:
0552+398 .
2007+777 .
P0128 .
Comments.
None.

Calibrated visibilities against u,v distance for:
0552+398. postscript , or png (smaller)
2007+777. postscript , or png (smaller)
P0128. postscript , or png (smaller)
Comments.
0552+398: very nice. 2007+777: lots of bad data needs flagging.

u,v coverage for:
0552+398. postscript , or png (smaller)
2007+777. postscript , or png (smaller)
P0128. postscript , or png (smaller)
Comments.
None.

0552+398: postscript , or FITS .
2007+777: postscript , or FITS .
P0128: postscript , or FITS .
Comments.
Nice maps for all sources.