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Last updated: Thu Aug 21 18:09:25 CEST 2008 muehle@jive.nl

General Comments. ( Brief data summary and scan listing )
L band (18cm) VLBI experiment, observed on 06 June 2008. The data rate was 1Gbps (8 X 16 MHz subbands, dual polarization, two-bit sampling). The target sources 'J021348' and 'J092159' were calibrated using the phase-reference sources 'J0209+1352' and 'J0920+4441'. 'J0204+1514', 'J0237+2848' and 'J0927+3902' 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 reported disk failures at 08:48 - 09:20 UT and 14:47 - 15:10 UT and seems to have recorded the data too fast. The telescope drive failed due to a modem failure from ~12:00 - 14:16 UT. 1Gbps recording was not possible afterwards. At Jb, the Lovell Telescope was used for these observations. Wb observed in phased-array mode and reported severe RFI at 13:00 UT for about 30 minutes. Subband 7 (IF 8) seems to be missing in the Wb data. At Mc, the station computer failed at 13:45 - 14:03 UT, scans #164-168 are lost. Data from Nt are missing for the time range 7:59 - 9:26 UT.

The EVN reliability indicator (ERI) for this experiment was ERI = 0.84 . ERI* = 0.84 . (Cm=0.32, Jb=1, Ef=1, Wb=0.88, On=1, Mc=0.98 , Nt=0.96, 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; Mc/IF1 (subband 0) and Nt/IF4L (subband 3) missing (see letter to P.I.); 482 pages

plots of the uncalibrated amplitude and phase against time
Comments.
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; 682 pages

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

TSYS against time
Comments.
Jb: T_sys varies significantly in IF5+6 at 03:30 - 05:00 UT and at 09:30 - 15:30 UT; Wb: IF2+3 noisier than the other IFs; On: spikes of high T_sys in IF3+4 at 11:00 - 15:30 UT; Mc: high T_sys in IF1+2; Tr : IF7 noisier than the other IFs; 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; Wb, On, Mc, Tr, Ur: fringe fit at 08:30 UT may be off; 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, very few outliers; 16 pages

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

Telescope bandpasses
Comments.
reference antenna: Ef; Jb/IF2R, Mc/IF2+8, Nt/IF1R, Cm/IF3: phases deviate significantly from zero; 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.) Jb: slope in amplitude in IFs 5+6 in scan #146; 76 pages

Calibrated amplitude and phase against frequency channel
Comments.
nothing unexpected detected; 662 pages

Naturally weighted dirty map (not useful for bright sources) produced before self-cal of:
J0927+3902: pdf (not available) , or FITS (not available) .
J021348: pdf , or FITS .
J0920+4441: pdf (not available) , or FITS (not available) .
J0209+1352: pdf (not available) , or FITS (not available) .
J092159: pdf , or FITS .
J0237+2848: pdf (not available) , or FITS (not available) .
J0204+1514: pdf (not available) , or FITS (not available) .
Comments.

Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
J0927+3902: pdf (not available) , or FITS (not available) .
J021348: pdf , or FITS .
J0920+4441: pdf (not available) , or FITS (not available) .
J0209+1352: pdf (not available) , or FITS (not available) .
J092159: pdf , or FITS .
J0237+2848: pdf (not available) , or FITS (not available) .
J0204+1514: pdf (not available) , or FITS (not available) .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
J0927+3902 .
J021348 (not available) .
J0920+4441 .
J0209+1352 .
J092159 (not available) .
J0237+2848 .
J0204+1514 .
Comments.
Cm may need prior flagging; all other stations: only small phase corrections, few outliers; 14-16 pages per source

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
J0927+3902: pdf , or text file , or statistical summary .
J021348: pdf (not available) , or text file (not available) , or statistical summary (not available) .
J0920+4441: pdf , or text file , or statistical summary .
J0209+1352: pdf , or text file , or statistical summary .
J092159: pdf (not available) , or text file (not available) , or statistical summary (not available) .
J0237+2848: pdf , or text file , or statistical summary .
J0204+1514: pdf , or text file , or statistical summary .
Comments.
Jb/IF1: low gain; Wb/IF1/R: high gain; Mc/IF2+8: high gain; Tr/IF7R: high gain; Cm: few good solutions; 14-16 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.
compare to "TSYS against time"; 16 pages

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
J0927+3902 .
J021348 (not available) .
J0920+4441 .
J0209+1352 .
J092159 (not available) .
J0237+2848 .
J0204+1514 .
Comments.
nothing unexpected detected; 12-17 pages per source

Calibrated visibilities and the source model of:
J0927+3902 .
J021348 (not available) .
J0920+4441 .
J0209+1352 .
J092159 (not available) .
J0237+2848 .
J0204+1514 .
Comments.
in general, very good agreement between data and models; 63-76 pages per source

Calibrated visibilities against u,v distance for:
J0927+3902: pdf , or png .
J021348: pdf , or png .
J0920+4441: pdf , or png .
J0209+1352: pdf , or png .
J092159: pdf , or png .
J0237+2848: pdf , or png .
J0204+1514: pdf , or png .
Comments.

u,v coverage for:
J0927+3902: pdf , or png .
J021348: pdf , or png .
J0920+4441: pdf , or png .
J0209+1352: pdf , or png .
J092159: pdf , or png .
J0237+2848: pdf , or png .
J0204+1514: pdf , or png .
Comments.

Crude maps of sources:
J0927+3902: pdf , or FITS .
J021348: pdf , or FITS .
J0920+4441: pdf , or FITS .
J0209+1352: pdf , or FITS .
J092159: pdf , or FITS .
J0237+2848: pdf , or FITS .
J0204+1514: pdf , or FITS .
Comments.