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Pipeline feedback for experiment GC031B. If you have any comments on this experiment please email the address below.
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Last updated: Fri Mar 20 18:34:32 CET 2009 muehle@jive.nl

General Comments. ( Brief data summary and scan listing )
C band (5 GHz) global VLBI experiment, observed on 24 October 2008. The data rate was 512 Mbps (4 x 16 MHz subbands, dual polarization, two-bit sampling). The target source 'Arp220' is calibrated using the phase-reference source 'J1532+2344'. 'J1613+3412' served as fringe finder. 'J1516+1932' and 'OQ208' were also observed as calibrators. Ef served as reference antenna. The plots show baselines to either Ef or Hn.
8 EVN stations (Ef, Wb, Jb, On, Mc, Nt, Tr, Ar) and 9 VLBA stations (Sc, Hn, Nl, Fd, La, Pt, Kp, Ov, Br) were scheduled in this experiment. Wb observed in phased array mode. Strong wind prevented On from observing. A detailed description of the individual antenna performances can be found in the PI letter in the section "Standardplots".

The EVN reliability indicator (ERI) for this experiment was ERI = 0.75 . ERI* = 1.0 . (Ef=1, Wb=1, Jb=1, On=0, Mc=1, Nt=1, Tr=1, Ar=1)

Plots of the autocorrelations
Comments.
in general, stable bandpasses; Wb: spiky but stable bandpasses; Jb: spiky but stable bandpasses, in particular IF1/L and IF2/L; Br: strong ringing in IF3/R+L ~17:35-18:00 UT, RFI?; 1030 pages

plots of the uncalibrated amplitude and phase against time
Comments.
Kp: IF4/R missing at ~17-19 UT; 64 pages

Plots of the uncalibrated amplitude and phase against frequency channel
Comments.
nothing unusual detected; 1457 pages

The uncalibrated amplitude and phase of the crosshand correlations against frequency channel
Comments.
phases of (polarization) calibrators look good, in particular for EVN stations and Hn, Nl, Pt, Ar; some temporary glitches at individual stations; 773 pages

TSYS against time
Comments.
Fd: high Tsys in all IFs/pols at start of observations around ~13:30 UT; Kp: high Tsys in all IFs/pols at start of observations around ~14 UT; Ov: high Tsys in all IFs/pols at start of observations around ~14-15 UT; Br: jumpy Tsys in IF3/R+L at ~17:40-18:00 UT, probably related to bandpass problems mentioned above; 12 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.
curves match closely those of T_sys vs. time; 12 pages

Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.
reference antenna: Ef, drift in phases reflects the parallactic angle correction; fast phase rotation, when elevation of the source is low at the station or at Ef (19-20 UT); 12 pages

Fringe-fit delay solutions
Comments.
reference antenna: Ef; delays of the order of (a few tens of) nanoseconds, very few outliers; 12 pages

Fringe-fit rate solutions
Comments.
reference antenna: Ef; rates of the order of mHz, very few outliers; 12 pages

Telescope bandpasses
Comments.
reference antenna: Ef; bandpasses look good, phases close to zero; 4 pages

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
Hn: may want to flag end of second scan on fringe finder (scan #324) in IF3/R; 56 pages

Calibrated amplitude and phase against frequency channel
Comments.
nothing unexpected detected; a few temporary glitches at individual stations, e.g. Fd/IF3/R at 17:58-18:00 UT; 1399 pages

Naturally weighted dirty map (not useful for bright sources) produced before self-cal of:
J1532+2344: pdf (not available) , or FITS (not available) .
ARP220: pdf , or FITS .
J1613+3412: pdf (not available) , or FITS (not available) .
J1516+1932: pdf (not available) , or FITS (not available) .
OQ208: pdf (not available) , or FITS (not available) .
Comments.
The cores of Arp220 are located 400 milliarcsec from the pointing center (see cover letter of the schedule).

Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
J1532+2344: pdf (not available) , or FITS (not available) .
ARP220: pdf , or FITS .
J1613+3412: pdf (not available) , or FITS (not available) .
J1516+1932: pdf (not available) , or FITS (not available) .
OQ208: pdf (not available) , or FITS (not available) .
Comments.
The cores of Arp220 are located 400 milliarcsec from the pointing center (see cover letter of the schedule).

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
J1532+2344 .
ARP220 (not available) .
J1613+3412 .
J1516+1932 .
OQ208 .
Comments.
refant: Ef; phase corrections look reasonable, few outliers; 12 pages per source

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
J1532+2344: pdf , or text file , or statistical summary .
ARP220: pdf (not available) , or text file (not available) , or statistical summary (not available) .
J1613+3412: pdf , or text file , or statistical summary .
J1516+1932: pdf , or text file , or statistical summary .
OQ208: pdf , or text file , or statistical summary .
Comments.
looks ok; Nt: gains in RCP a bit high; 12 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.
a few spikes in the data, should be flagged; 12 pages

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
J1532+2344 .
ARP220 (not available) .
J1613+3412 .
J1516+1932 .
OQ208 .
Comments.
some outliers, but nothing unexpected; J1613+3412: loops including Hn look a bit worse, should flag Hn towards the end of the second fringe finder scan; 49 pages per source

Calibrated visibilities and the source model of:
J1532+2344 .
ARP220 (not available) .
J1613+3412 .
J1516+1932 .
OQ208 .
Comments.
in general, very good agreement between data and models; 56 pages per source

Calibrated visibilities against u,v distance for:
J1532+2344: pdf , or png .
ARP220: pdf , or png .
J1613+3412: pdf , or png .
J1516+1932: pdf , or png .
OQ208: pdf , or png .
Comments.

u,v coverage for:
J1532+2344: pdf , or png .
ARP220: pdf , or png .
J1613+3412: pdf , or png .
J1516+1932: pdf , or png .
OQ208: pdf , or png .
Comments.

Crude maps of sources:
J1532+2344: pdf , or FITS .
ARP220: pdf , or FITS .
J1613+3412: pdf , or FITS .
J1516+1932: pdf , or FITS .
OQ208: pdf , or FITS .
Comments.
The cores of Arp220 are located 400 milliarcsec from the pointing center (see cover letter of the schedule).