EVN Network Monitoring Experiment (NME) Pipeline Feedback


Pipeline feedback for experiment N04C2. 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 Jul 20 12:32:36 CEST 2004 zparagi@jive.nl

General Comments. ( Brief data summary and scan listing )
C-band NME observed on 20 May 2004 (session 2/2004). This experiment was recorded at 256 Mbps using 2-bit sampling which resulted in 32 MHz bandwidth in each polarization. Van-Vleck correction was not applied to the data.

Shanghai and Torun observed on tape, all others on disk. In Cm there were fringes only in channels L2-3 and R2-3 due to the microwave link limitations. Sh had no RCP receiver. Ur could not join the experiment (and most of the session session) due to a receiver upgrade. In Jb the MarkII telescope was used.

There were five sources, two-two were observed in phase-reference mode: 3C273B - 1222+037 (1.8 deg. separation), and 3C345 - 1633+382 (2.3 deg. separation). The reference-target cycle time was 6.5 minutes.

The ratio of the expected to the observed number of good visibilities is estimated as ERI=ERI*=1.0 (Ef=1.0, Mc=1.0, Jb=1.0, Wb=1.0, On=1.0, Nt=1.0, Sh=0.5/0.5 (only LCP expected; ~20 minutes gap on VPLOT due to sources below horizon), Hh=1.0, Tr=1.0, Cm=0.5/0.5 (only ~14 MHz/polarization)).

Plots of the autocorrelations .
Comments.

Plots of the uncalibrated amplitude and phase against time .
Comments.
Sources were clearly detected on all baselines. Apparent amplitude variation is due to source switching.

Plots of the uncalibrated amplitude and phase against frequency channel .
Comments.
Good data in all channels where expected.

The uncalibrated amplitude and phase of the crosshand correlations against frequency channel .
Comments.
Westerbork polarization leakage seems to be high. Compare POSSM_UNCAL/POSSM_CPOL plots on OQ208 (unpolarized source).

TSYS against time .
Comments.
Apparent quick changes in Tsys was due to quick switching between very bright targets.

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.
Jb seems to be more sensitive than expected (SEFD=320 Jy). See the EVN Status Table).

Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.

Fringe-fit delay solutions .
Comments.

Fringe-fit rate solutions .
Comments.

Telescope bandpasses .
Comments.

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Some large phase differences seen, especially in the first phase-reference pair, and on the longest baselines.

Calibrated amplitude and phase against frequency channel .
Comments.

Naturally weighted dirty map produced before self-cal of:
3C273B: postscript , or FITS .
1222+037: postscript , or FITS .
3C345: postscript , or FITS .
1633+382: postscript , or FITS .
OQ208: postscript , or FITS .
Comments.

Uniformly weighted dirty map produced before self-cal of:
3C273B: postscript , or FITS .
1222+037: postscript , or FITS .
3C345: postscript , or FITS .
1633+382: postscript , or FITS .
OQ208: postscript , or FITS .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C273B.
1222+037. (not available)
3C345. (not available)
1633+382. (not available)
OQ208. (not available)
Comments.

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C273B: postscript , or text file .
1222+037: postscript (not available) , or text file (not available) .
3C345: postscript (not available) , or text file (not available) .
1633+382: postscript (not available) , or text file (not available) .
OQ208: postscript (not available) , or text file (not available) .
Comments.
Corrections are in general small. Onsala has some high corrections (up to a factor of 2 in Tsys).

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.
Jb seems to be more sensitive than expected (SEFD=320 Jy). See the EVN Status Table).

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
3C273B .
1222+037 .
3C345 .
1633+382 .
OQ208 .
Comments.

Calibrated visibilities and the source model of:
3C273B .
1222+037 .
3C345 .
1633+382 .
OQ208 .
Comments.

Calibrated visibilities against u,v distance for:
3C273B. postscript , or png (smaller)
1222+037. postscript , or png (smaller)
3C345. postscript , or png (smaller)
1633+382. postscript , or png (smaller)
OQ208. postscript , or png (smaller)
Comments.

u,v coverage for:
3C273B. postscript , or png (smaller)
1222+037. postscript , or png (smaller)
3C345. postscript , or png (smaller)
1633+382. postscript , or png (smaller)
OQ208. postscript , or png (smaller)
Comments.

3C273B: postscript , or FITS .
1222+037: postscript , or FITS .
3C345: postscript , or FITS .
1633+382: postscript , or FITS .
OQ208: postscript , or FITS .
Comments.