EVN Network Monitoring Experiment (NME) Pipeline Feedback


Pipeline feedback for experiment N05C1. 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 Apr 7 14:24:32 CEST 2005 biggs@jive.nl


General Comments. ( Brief data summary and scan listing )
C-band NME observed on 24 Feb. 2005 (session 1/2005). This experiment was recorded at 256 Mbps using 2-bit sampling. Dual polarisation, 32-MHz bandwidth. Nt didn't participate and Sh could not observe due to an antenna problem. On produced no data for most of the experiment due to a technical problem; the last hour from this telescope appears to be okay. Ef had to stop due to snow for about an hour. Jb stopped half an hour before the end. The experiment consists of observations of four sources, DA193 and OQ208, plus 4C39.25 and J0916+3854 in a phase-referencing cycle. This pipeline used J0916+3854 data to calibrate the phases of 4C39.25. The ratio of the expected to the observed number of good visibilities is estimated as ERI = 0.50 (Ef=0.74, Mc=1.0, Wb=1.0, On=0.2, Tr=0.75, Jb=0.95, Ur=0.95, Sh=0.0, Hh=0.93). ERI* = 0.54.


Plots of the autocorrelations .
Comments.
None.


Plots of the uncalibrated amplitude and phase against time .
Comments.
None.


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


The uncalibrated amplitude and phase of the crosshand correlations against frequency channel .
Comments.
None.


TSYS against time .
Comments.
Wb: times in antab file were for a completely different day (day 33 instead of 55), but the times were vaguely correct.
Ef: large increase corresponds to antenna not observing during snow storm.


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.
EVN Status Table). Most telescopes perform worse than expected, probably due to snow. The DPFU values for Tr in the antab file are rubbish. Using those found from a previous NME gives much better results.


Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.
None.


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.
Phase referencing seems to have worked generally quite well except for at Hh where the phases deviate strongly from zero and the offset changes with time.


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


Naturally weighted dirty map produced before self-cal of:
OQ208: postscript , or FITS .
DA193: postscript , or FITS .
4C39.25: postscript , or FITS .
J0916+3854: postscript , or FITS .
Comments.


Uniformly weighted dirty map produced before self-cal of:
OQ208: postscript , or FITS .
DA193: postscript , or FITS .
4C39.25: postscript , or FITS .
J0916+3854: postscript , or FITS .
Comments.


Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
OQ208.
DA193.
4C39.25.
J0916+3854.
Comments.
Corrections for Hh on 4C39.25 are large towards beginning of experiment, but do not correct the phase referencing "error".


Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
OQ208: postscript , or text file .
DA193: postscript , or text file .
4C39.25: postscript , or text file .
J0916+3854: postscript , or text file .
Comments.
Corrections are generally close to unity, but vary by about +/- 10%. Urumqi corrections are very large due to the snow.


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.
EVN Status Table).


Residual closure phase (visibility closure phase with model closure phase subtracted) for:
OQ208 .
DA193 .
4C39.25 .
J0916+3854 .
Comments.
The offsets for OQ208 are quite large.


Calibrated visibilities and the source model of:
OQ208 .
DA193 .
4C39.25 .
J0916+3854 .
Comments.
Source model for 4C39.25 fits the Hh data very well, but this may be due to a lack of constraints and not source structure.


Calibrated visibilities against u,v distance for:
OQ208. postscript , or png (smaller)
DA193. postscript , or png (smaller)
4C39.25. postscript , or png (smaller)
J0916+3854. postscript , or png (smaller)
Comments.
Some bad data remains on 4C39.25 and DA193 particularly.


u,v coverage for:
OQ208. postscript , or png (smaller)
DA193. postscript , or png (smaller)
4C39.25. postscript , or png (smaller)
J0916+3854. postscript , or png (smaller)
Comments.
None.


OQ208: postscript , or FITS .
DA193: postscript , or FITS .
4C39.25: postscript , or FITS .
J0916+3854: postscript , or FITS .
Comments.
All sources detected.