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Last updated: Thu Aug 21 21:44:06 CEST 2008 muehle@jive.nl

General Comments. ( Brief data summary and scan listing )
L band (18cm) VLBI experiment, observed on 08 June 2008. The data rate was 1Gbps (8 X 16 MHz subbands, dual polarization, two-bit sampling). The target source 'J210358' was calibrated using the phase-reference source 'J2110-1020'. 'J2253+1608' ('3C454.3') was also observed as a calibrator and served as fringe finder. The solint was 1.75 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. Subband 7 (IF 8) seems to be missing in the Wb data. On reported minor Mark5 problems at 03:27-03:50 UT.

The EVN reliability indicator (ERI) for this experiment was ERI = 0.85 . ERI* = 0.85 . (Cm=0.34, Jb=1, Ef=1, Wb=0.88, On=0.94, 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, Tr/IF1+7, at some times also in On/IF3 or IF4, Ur/IF1+2 and Sh/IF2; Mc/IF1 (subband 0) and Nt/IF4L (subband 3) missing (see letter to P.I.); 220 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.); Nt: IF1/R missing at 02:14 - 04:51 UT, IF2/R missing at 02:09 - 05:05 UT; 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, some bad scans at 03:50 - 04:03 UT; Nt: in the beginning, phase jumps or fast phase rotation, ok after 00:23 UT; Mc: amplitude drops off significantly in IF2 and IF8 (subbands 1 and 7); 328 pages

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

TSYS against time
Comments.
Jb: some spikes of high T_sys; Wb: IF2+3 noisier than the other IFs; On: some spikes of high T_sys, mostly in lower IFs; Mc: spikes of increased T_sys in IF5+6/L at 03:00 - 06:00 UT; Nt: IF1/R missing from ~00:45 UT, IF2/R missing from ~02:00 UT; 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; Sh/IF8L: no good solutions; 17 pages

Fringe-fit delay solutions
Comments.
reference antenna: Ef; except for Cm/IF3 and the first bad scans of Nt (see above), delays of the order of (tens of) nanoseconds; 17 pages

Fringe-fit rate solutions
Comments.
reference antenna: Ef; rates of the order of a few mHz; 17 pages

Telescope bandpasses
Comments.
reference antenna: Ef; Jb/IF2R, Mc/IF2+8, Nt/IF1R: phases deviate significantly from zero/strong slope in bandpass; 3 pages

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Cm: signal constrained to upper half of IF3 and lower half of IF4; patchy data; Jb: significant slope in amplitude in IF5L in scan #15; 77 pages

Calibrated amplitude and phase against frequency channel
Comments.
Nt: a few bad scans in the beginning (see above); Cm: some bad scans at 03:50 - 04:03 UT (see above); 326 pages

Naturally weighted dirty map (not useful for bright sources) produced before self-cal of:
J210358: pdf , or FITS .
J2110-1020: pdf (not available) , or FITS (not available) .
J2253+1608: pdf (not available) , or FITS (not available) .
Comments.

Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
J210358: pdf , or FITS .
J2110-1020: pdf (not available) , or FITS (not available) .
J2253+1608: pdf (not available) , or FITS (not available) .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
J210358 (not available) .
J2110-1020 .
J2253+1608 .
Comments.
Cm may need prior flagging; all other stations: only small phase corrections, few outliers; 16 pages per source

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
J210358: pdf (not available) , or text file (not available) , or statistical summary (not available) .
J2110-1020: pdf , or text file , or statistical summary .
J2253+1608: pdf , or text file , or statistical summary .
Comments.
Jb/IF1: low gain; Mc/IF1R,IF2,IF8: high gain; 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"; Nt: first ~25 minutes low sensitivity (bad scans, see above); 16 pages

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
J210358 (not available) .
J2110-1020 .
J2253+1608 .
Comments.
nothing unexpected detected; 17-19 pages per source

Calibrated visibilities and the source model of:
J210358 (not available) .
J2110-1020 .
J2253+1608 .
Comments.
in general, very good agreement between data and models; 76 pages per source

Calibrated visibilities against u,v distance for:
J210358: pdf , or png .
J2110-1020: pdf , or png .
J2253+1608: pdf , or png .
Comments.

u,v coverage for:
J210358: pdf , or png .
J2110-1020: pdf , or png .
J2253+1608: pdf , or png .
Comments.

Crude maps of sources:
J210358: pdf , or FITS .
J2110-1020: pdf , or FITS .
J2253+1608: pdf , or FITS .
Comments.