EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment EO006A. If you have any comments on this experiment please email the address below.
A detailed description of the pipeline output is available.

Last updated: Fri Aug 22 13:58:22 CEST 2008 muehle@jive.nl

General Comments. ( Brief data summary and scan listing )
L band (18cm) VLBI experiment, observed on 04 June 2008. The data rate was 1Gbps (8 X 16 MHz subbands, dual polarization, two-bit sampling). The target source 'J015028' was calibrated using the phase-reference source 'J0158+1307'. 'J0204+1514' and 'J0237+2848' were also observed as calibrators. 'J0237+2848' served as fringe finder. The solint was 1.6 minutes. Ef served as reference antenna. The plots show baselines to either Ef or Jb.
11 stations participated in the experiment: Cm, Jb1, Ef, Wb, On85, Mc, Nt, Tr, Ur, Sh, and Hh. At Cm, the signal is limited to the upper half of subband 2 (IF3) and the lower half of subband 3 (IF4) because of the bandwidth limitations of the microwave link. In addition, Cm seems to have recorded the data too fast. At Jb, the Lovell Telescope was used for these observations. Wb observed in phased-array mode and was on source 25 minutes late because of a false storm alarm. Subband 7 (IF 8) seems to be missing in the Wb data. Mc noted that VC #7 and #8, corresponding to subbands 6+7/R+L, were slightly beyond the frequency limits imposed by the RFI.

The EVN reliability indicator (ERI) for this experiment was ERI = 0.88 . ERI* = 0.88 . (Cm=0.52, Jb=1, Ef=1, Wb=0.81, On=1, Mc=1, Nt=1, Tr=1, Ur=1, Sh=1, Hh=1 )

Plots of the autocorrelations
Comments.
As to be expected at 18cm, low-to-mid-level RFI at almost all stations, in particular in Mc/IF2+8 and Tr/IF1+7, at some times also in Ef/IF4 and On/IF3+5; Mc/IF1 (subband 0) and Nt/IF4L,7L,8L (subbands 3,6,7) missing (see letter to P.I.); 265 pages

plots of the uncalibrated amplitude and phase against time
Comments.
Wb: 25 minutes late on source; Cm: signal constrained to upper half of IF3 and lower half of IF4 because of the bandwidth limitations of the microwave link, patchy data, probably because data were recorded too fast (see letter to P.I.); 80 pages

Plots of the uncalibrated amplitude and phase against frequency channel
Comments.
Cm: signal constrained to upper half of IF3 and lower half of IF4 because of the bandwidth limitations of the microwave link; 368 pages

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

TSYS against time
Comments.
Jb: T_sys varies strongly in IF5+6/R+L at 03:00 - 05:00 UT and at 06:15 UT; Wb: IF2+3/R+L noisier than the other IFs; On: high T_sys at 03:00 - 03:30 UT; Mc: increased T_sys in IF5+6/L at 06:40 - 07:00 UT; Ur: T_sys unusually low; 18 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.
see "TSYS against time"; 18 pages

Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.
reference antenna: Ef, drift in phases reflects the parallactic angle correction; Sh/IF8L: no good solutions; 16 pages

Fringe-fit delay solutions
Comments.
reference antenna: Ef; delays of the order of (a few tens of) nanoseconds, except for scans #50 and #51 in Cm/IF3; 16 pages

Fringe-fit rate solutions
Comments.
reference antenna: Ef; rates of the order of a few mHz; 16 pages

Telescope bandpasses
Comments.
reference antenna: Ef; Sh: IF4/R may be bad (amplitude and phase); Cm: bad phases in IF3 (subband 2); 3 pages

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Cm: patchy data, probably because data were recorded too fast (see letter to P.I.) Wb: noisy amplitude in IF2/L+R; Jb: slope in amplitude in IFs 5+6 in scan #50; 74 pages

Calibrated amplitude and phase against frequency channel
Comments.
Cm: pipeline calibration may not be good; Sh: IF4/R may be problematic; 361 pages

Naturally weighted dirty map (not useful for bright sources) produced before self-cal of:
J0204+1514: pdf (not available) , or FITS (not available) .
J015028: pdf , or FITS .
J0158+1307: pdf (not available) , or FITS (not available) .
J0237+2848: pdf (not available) , or FITS (not available) .
Comments.

Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
J0204+1514: pdf (not available) , or FITS (not available) .
J015028: pdf , or FITS .
J0158+1307: pdf (not available) , or FITS (not available) .
J0237+2848: pdf (not available) , or FITS (not available) .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
J0204+1514 .
J015028 (not available) .
J0158+1307 .
J0237+2848 .
Comments.
except for Cm, small phase corrections as expected, few outliers; 16 pages per source

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
J0204+1514: pdf , or text file , or statistical summary .
J015028: pdf (not available) , or text file (not available) , or statistical summary (not available) .
J0158+1307: pdf , or text file , or statistical summary .
J0237+2848: pdf , or text file , or statistical summary .
Comments.
Jb/IF1/R+L: low gain; Wb/IF1/R: high gain; Mc/IF2+8/R+L: high gain; Cm: few good solutions; 16 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.
nothing unexpected detected; 16 pages

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
J0204+1514 .
J015028 (not available) .
J0158+1307 .
J0237+2848 .
Comments.
nothing unexpected detected; 17 pages per source

Calibrated visibilities and the source model of:
J0204+1514 .
J015028 (not available) .
J0158+1307 .
J0237+2848 .
Comments.
in general, very good agreement between data and models; 72-74 pages per source

Calibrated visibilities against u,v distance for:
J0204+1514: pdf , or png .
J015028: pdf , or png .
J0158+1307: pdf , or png .
J0237+2848: pdf , or png .
Comments.

u,v coverage for:
J0204+1514: pdf , or png .
J015028: pdf , or png .
J0158+1307: pdf , or png .
J0237+2848: pdf , or png .
Comments.

Crude maps of sources:
J0204+1514: pdf , or FITS .
J015028: pdf , or FITS .
J0158+1307: pdf , or FITS .
J0237+2848: pdf , or FITS .
Comments.