EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment GV018B. 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 Aug 3 17:58:31 CEST 2006 reynolds@jive.nl

General Comments. ( Brief data summary and scan listing )
UHF band spectral-line experiment, observed on 4 June 2006. Data rate was 32 Mbps (1 X 4 MHz subbands, dual polarization, two-bit sampling). '3C84', 'CTA21', and '3C454.3' were calibrators.
6 stations participated. RFI severely affected these observations. Noto produced fringes only in LCP. Onsala has signal only in the lower three-quarters of the band.

The EVN reliability indicator (ERI) for this experiment was ERI = 0.75 . ERI* = 0.75 . (Ef=1, Wb=1, On=.75, Nt=0.5, Tr=1, Gb=1)

Plots of the autocorrelations
Comments.
Severe RFI in Europe for much of the experiment. GBT relatively clear.

plots of the uncalibrated amplitude and phase against time
Comments.
Bright calibrators clearly detected at all stations.

Plots of the uncalibrated amplitude and phase against frequency channel
Comments.
RFI strong enough to be seen in the cross-correlations.

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

TSYS against time
Comments.
RFI was too strong to make valid Tsys measurements at Onsala, so an approximation has been used.

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.
A priori gains indicate that sensitivity of Torun is very low (SEFD ~ 4000 Jy). Amplitude corrections (below) indicate that the sensitivity was actually much better than this.

Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.
Pipeline fringe fitting only worked for the brightest calibrators at Onsala and Noto.

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 (not useful for bright sources) produced before self-cal of:
CTA21: pdf (not available) , or FITS (not available) .
3C84: pdf (not available) , or FITS (not available) .
J0240-2309: pdf (not available) , or FITS (not available) .
J0134-0931: pdf (not available) , or FITS (not available) .
3C454.3: pdf (not available) , or FITS (not available) .
Comments.

Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
CTA21: pdf (not available) , or FITS (not available) .
3C84: pdf (not available) , or FITS (not available) .
J0240-2309: pdf (not available) , or FITS (not available) .
J0134-0931: pdf (not available) , or FITS (not available) .
3C454.3: pdf (not available) , or FITS (not available) .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
CTA21 .
3C84 .
J0240-2309 .
J0134-0931 .
3C454.3 .
Comments.

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
CTA21: pdf , or text file , or statistical summary .
3C84: pdf , or text file , or statistical summary .
J0240-2309: pdf , or text file , or statistical summary .
J0134-0931: pdf , or text file , or statistical summary .
3C454.3: pdf , or text file , or statistical summary .
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.
Amplitude corrections for Onsala, Torun and Noto are very large. Accuracy of other stations is not great either.

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
CTA21 .
3C84 .
J0240-2309 .
J0134-0931 .
3C454.3 .
Comments.

Calibrated visibilities and the source model of:
CTA21 .
3C84 .
J0240-2309 .
J0134-0931 .
3C454.3 .
Comments.

Calibrated visibilities against u,v distance for:
CTA21: pdf , or png .
3C84: pdf , or png .
J0240-2309: pdf , or png .
J0134-0931: pdf , or png .
3C454.3: pdf , or png .
Comments.

u,v coverage for:
CTA21: pdf , or png .
3C84: pdf , or png .
J0240-2309: pdf , or png .
J0134-0931: pdf , or png .
3C454.3: pdf , or png .
Comments.

Crude maps of sources:
CTA21: pdf , or FITS .
3C84: pdf , or FITS .
J0240-2309: pdf , or FITS .
J0134-0931: pdf , or FITS .
3C454.3: pdf , or FITS .
Comments.
Pipeline maps very poor in this experiment. Much more careful processing required...