EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment GV019A. If you have any comments on this experiment please email the address below.
A detailed description of the pipeline output is available.

Last updated: Wed Jul 30 19:00:06 CEST 2008 muehle@jive.nl

General Comments. ( Brief data summary and scan listing )
L band (18 cm) global VLBI experiment, observed on 04 March 2008. The data rate was 128Mbps (2 X 8 MHz subbands, dual polarization, two-bit sampling). The target sources J0733+5605, J1409+3604, J1209+4115, J1602+5243, and J1037+4335 were calibrated using the calibrator sources 4C39.25 and J1429+5406. 4C39.25 also served as the fringe finder. For this pipeline data reduction, the solint was set to 3 minutes. Wb served as the reference antenna. The plots show baselines to either Wb or Pt.
Of the 16 scheduled stations, 14 stations could participate in this experiment: Wb, Jb1, On25, Mc, Nt, Tr, Sc, Hn, Nl, La, Pt, Kp, Ov, Br. Ef was stowed due to snow. Fd was out due to EL bearing problems. Wb was used in phased array mode. Tr lost 43 minutes at the start, because the antenna control computer hung.

The EVN reliability indicator (ERI) for this experiment was ERI = 0.68 . ERI* = 0.96 . (EF=0, WB=1, JB=1, ON=1, MC=1, NT=1, TR=0.88)

Plots of the autocorrelations
Comments.
As to be expected at this frequency, some stations show low-to-intermediate RFI: low-level RFI at Kp/IF2, Wb/IF1, Mc/IF2, intermediate-level RFI at Mc/IF1, Nt/IF1, Jb/IF2 (100 pages).

plots of the uncalibrated amplitude and phase against time
Comments.
Wb: source too low in scan 12 (3:19 - 3:30 UT); Tr: 43 minutes late (28 pages).

Plots of the uncalibrated amplitude and phase against frequency channel
Comments.
Jb: amplitude of IF2/RR+LL much lower in first calibrator scan (scan #1) than in second calibrator scan (scan #7), should be fine after calibration; phases can easily be followed in calibrators (153 pages).

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

TSYS against time
Comments.
Ov: jump in T_sys at ~4:30 UT; On: small spike in T_sys shortly before 4:00 UT (6 pages).

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.
Ov: jump at ~4:30 UT (6 pages).

Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.
reference antenna is Wb; Tr/IF2R: fast fringes at 1:30 - 4:45 UT (6 pages).

Fringe-fit delay solutions
Comments.
reference antenna is Wb; nothing unexpected detected (6 pages).

Fringe-fit rate solutions
Comments.
reference antenna is Wb; Tr/IF2R: rate is slightly increased at 1:30 - 4:45 UT, but still ok (6 pages).

Telescope bandpasses
Comments.
reference antenna is Wb, thus its characteristic curvature in the phase is reflected in all plotted phases (4 pages).

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Tr: amplitude in scan 23 (05:56 - 6:07 UT) looks instable in IF2/LL+RR (28 pages).

Calibrated amplitude and phase against frequency channel
Comments.
nothing unexpected detected, amplitude of Jb/IF2 looks fine (123 pages).

Naturally weighted dirty map (not useful for bright sources) produced before self-cal of:
J0733+5605: pdf (not available) , or FITS (not available) .
J1409+3604: pdf (not available) , or FITS (not available) .
J1209+4115: pdf (not available) , or FITS (not available) .
J1429+5406: pdf (not available) , or FITS (not available) .
J1602+5243: pdf (not available) , or FITS (not available) .
J1037+4335: pdf (not available) , or FITS (not available) .
4C39.25: pdf (not available) , or FITS (not available) .
Comments.

Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
J0733+5605: pdf (not available) , or FITS (not available) .
J1409+3604: pdf (not available) , or FITS (not available) .
J1209+4115: pdf (not available) , or FITS (not available) .
J1429+5406: pdf (not available) , or FITS (not available) .
J1602+5243: pdf (not available) , or FITS (not available) .
J1037+4335: pdf (not available) , or FITS (not available) .
4C39.25: pdf (not available) , or FITS (not available) .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
J0733+5605 .
J1409+3604 .
J1209+4115 .
J1429+5406 .
J1602+5243 .
J1037+4335 .
4C39.25 .
Comments.
nothing unexpected detected (4-6 pages per source).

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
J0733+5605: pdf , or text file , or statistical summary .
J1409+3604: pdf , or text file , or statistical summary .
J1209+4115: pdf , or text file , or statistical summary .
J1429+5406: pdf , or text file , or statistical summary .
J1602+5243: pdf , or text file , or statistical summary .
J1037+4335: pdf , or text file , or statistical summary .
4C39.25: pdf , or text file , or statistical summary .
Comments.
nothing unexpected detected (4-6 pages per source).

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.
VLBA stations tend to be more sensitive in IF2 than in IF1 (6 pages).

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
J0733+5605 .
J1409+3604 .
J1209+4115 .
J1429+5406 .
J1602+5243 .
J1037+4335 .
4C39.25 .
Comments.
nothing unexpected detected (up to 50 pages per source).

Calibrated visibilities and the source model of:
J0733+5605 .
J1409+3604 .
J1209+4115 .
J1429+5406 .
J1602+5243 .
J1037+4335 .
4C39.25 .
Comments.
good agreement between models and data (up to 28 pages per source).

Calibrated visibilities against u,v distance for:
J0733+5605: pdf , or png .
J1409+3604: pdf , or png .
J1209+4115: pdf , or png .
J1429+5406: pdf , or png .
J1602+5243: pdf , or png .
J1037+4335: pdf , or png .
4C39.25: pdf , or png .
Comments.

u,v coverage for:
J0733+5605: pdf , or png .
J1409+3604: pdf , or png .
J1209+4115: pdf , or png .
J1429+5406: pdf , or png .
J1602+5243: pdf , or png .
J1037+4335: pdf , or png .
4C39.25: pdf , or png .
Comments.

Crude maps of sources:
J0733+5605: pdf , or FITS .
J1409+3604: pdf , or FITS .
J1209+4115: pdf , or FITS .
J1429+5406: pdf , or FITS .
J1602+5243: pdf , or FITS .
J1037+4335: pdf , or FITS .
4C39.25: pdf , or FITS .
Comments.