EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment GP036B. 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 Sep 20 17:00:01 CEST 2004 zparagi@jive.nl

General Comments. ( Brief data summary and scan listing )
This was an experiment with 256-4-2 recording mode that resulted in two 16 MHz channels in each of the RCP and LCP polarizations. Observed with a global VLBI network of the VLBA, a single dish of the VLA, the Green Bank Telescope, EVN and MERLIN. Recorded on tape. MERLIN (including Cm and the Lovell Telescope) failed after 24:00, soon after the start of the experiment. There were no fringes to Jodrell Bank at all.

The Tsys data were missing in the second half of the experiment for Green Bank. Tsys points typical to the sources were inserted into the ANTAB table. This recovered some good data for Gb. The Tr and Nt gaincurves were made flat, and the gain values were adjusted based on imaging results. There were also problems with the Tsys data at these station. In addition, the recording quality was not very good in Noto.

There were several bright calibrators observed in this expeirment: 3C286 (for Westerbork only), 3C345, OQ208, NRAO512, J2002+4725, and J1832+1357.

The estimated ERI (ratio of the number of good visibilities to the expected number of visibilities) is 0.46 (counting only the EVN data). The losses were all due to technical failures. The individual stations contribute to these losses as the following (1 meaning perfect data all the time): Eb - 0.99, Mc - 0.98, Wb - 0.95, On - 0.9, Tr - 0.98, Nt - 0.5, Hh - 0.8, Jb - 0.0, Cm - 0.15.

Plots of the autocorrelations .
Comments.

Plots of the uncalibrated amplitude and phase against time .
Comments.
Nt: much data is missing due to the bad recording.
Cm: there was signal only in L2/R2, due to the microwave link limitations.

Plots of the uncalibrated amplitude and phase against frequency channel .
Comments.

The uncalibrated amplitude and phase of the crosshand correlations against frequency channel .
Comments.

TSYS against time .
Comments.
See general notes above.

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.
Nt and Tr a-priori calibration was bad - see general notes above. The other stations were OK (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.

Calibrated amplitude and phase against frequency channel .
Comments.

Naturally weighted dirty map produced before self-cal of:
3C286: postscript , or FITS .
OQ208: postscript , or FITS .
NRAO512: postscript , or FITS .
3C345: postscript , or FITS .
J1832+1357: postscript , or FITS .
J2002+4725: postscript , or FITS .
Comments.

Uniformly weighted dirty map produced before self-cal of:
3C286: postscript , or FITS .
OQ208: postscript , or FITS .
NRAO512: postscript , or FITS .
3C345: postscript , or FITS .
J1832+1357: postscript , or FITS .
J2002+4725: postscript , or FITS .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C286.
OQ208.
NRAO512.
3C345.
J1832+1357.
J2002+4725.
Comments.

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
3C286: postscript , or text file .
OQ208: postscript , or text file .
NRAO512: postscript , or text file .
3C345: postscript , or text file .
J1832+1357: postscript , or text file .
J2002+4725: postscript , or text file .
Comments.

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.
The scale is wrong due to wild points for Noto. Most stations were OK except Nt and Tr (see notes above).

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
3C286 .
OQ208 .
NRAO512 .
3C345 .
J1832+1357 .
J2002+4725 .
Comments.

Calibrated visibilities and the source model of:
3C286 .
OQ208 .
NRAO512 .
3C345 .
J1832+1357 .
J2002+4725 .
Comments.

Calibrated visibilities against u,v distance for:
3C286. postscript , or png (smaller)
OQ208. postscript , or png (smaller)
NRAO512. postscript , or png (smaller)
3C345. postscript , or png (smaller)
J1832+1357. postscript , or png (smaller)
J2002+4725. postscript , or png (smaller)
Comments.

u,v coverage for:
3C286. postscript , or png (smaller)
OQ208. postscript , or png (smaller)
NRAO512. postscript , or png (smaller)
3C345. postscript , or png (smaller)
J1832+1357. postscript , or png (smaller)
J2002+4725. postscript , or png (smaller)
Comments.

3C286: postscript , or FITS .
OQ208: postscript , or FITS .
NRAO512: postscript , or FITS .
3C345: postscript , or FITS .
J1832+1357: postscript , or FITS .
J2002+4725: postscript , or FITS .
Comments.