EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment GF015B. If you have any comments on this experiment please email the address below.
A detailed description of the pipeline output is available.

Last updated: Tue Oct 12 07:20:57 CEST 2010 muehle@jive.nl

General Comments. ( Brief data summary and scan listing )
L band (18 cm) global VLBI experiment, observed on 08 November 2009. The data rate was 128 Mbps (2 x 8 MHz subbands, dual polarization, two-bit sampling). The target source 'M82' was calibrated using the phase-reference source 'J0958+65'. 'J0927+39' and '3C84 were also observed as fringe finders and calibrators. In this pipeline reduction, Ef served as reference antenna and as plot reference, i.e. the plots show baselines to Ef.
6 EVN stations (Da, Ef, Jb, Mc, Nt, Tr) and all 10 VLBA stations were scheduled in this experiment. At Jb, the Lovell Telescope was used. Da replaced the originally scheduled Cm. Mc was out until 07:40 UT due to problems with the Mark5 recorder. Tr was 9 minutes late. Mk started at 06:42 UT as scheduled. Sc experienced frequent periods of lost communications between 07:23 UT and the end of its schedule at 20:11 UT. Kp was out of point at 09:09-09:28 UT. OV reported HC1 FIFO errors at 12:58-13:02 UT. Pt automatically stowed due to a power glitch at 21:46-21:49 UT. More information can be found in the P.I. letter which is also available from the archive (section "Standardplots").

The EVN reliability indicator (ERI) for this experiment was ERI = 0.94 . ERI* = 0.94 . (Da=1, Ef=1, Jb1=1, Mc=0.85, Nt=1, Tr=0.99)

Plots of the autocorrelations
Comments.
low- to intermediate-level RFI at some stations; Ef: bad spike in IF1/R; La: bad spike in IF1/L+R; 1160 pages

plots of the uncalibrated amplitude and phase against time
Comments.
phases of the calibrators can be followed even in the uncalibrated data; 16 pages

Plots of the uncalibrated amplitude and phase against frequency channel
Comments.
phases can be followed in the calibrators and the phase-reference source; Da: fast phase rotation in upper quarter of IF2/R+L; 1121 pages

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

TSYS against time
Comments.
looks reasonable; Hn: generally high T_sys; 7 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; 7 pages

Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.
looks reasonable; reference antenna: Ef, drift in phases reflects the parallactic angle correction; 7 pages

Fringe-fit delay solutions
Comments.
reference antenna: Ef; delays of the order of (tens of) nanoseconds; Da: a few outliers; 7 pages

Fringe-fit rate solutions
Comments.
reference antenna: Ef; rates of the order of a few mHz; Da: a few outliers; 7 pages

Telescope bandpasses
Comments.
reference antenna: Ef; in general, bandpasses look good and phases close to zero (except for edges of Da); 2 pages

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.
phases of calibrators in general close to zero, amplitudes look reasonable; 16 pages

Calibrated amplitude and phase against frequency channel
Comments.
phases of the phase-reference source in general close to zero; phases of the calibrators close to zero, too, except for 3C84 on long baselines (extended source); Hn: amplitudes of Ef-Hn differ significantly from those of similar baselines; 1109 pages

Naturally weighted dirty map (not useful for bright sources) produced before self-cal of:
M82: pdf , or FITS .
J0927+39: pdf (not available) , or FITS (not available) .
3C84: pdf (not available) , or FITS (not available) .
J0958+65: pdf (not available) , or FITS (not available) .
Comments.

Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
M82: pdf , or FITS .
J0927+39: pdf (not available) , or FITS (not available) .
3C84: pdf (not available) , or FITS (not available) .
J0958+65: pdf (not available) , or FITS (not available) .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
M82 (not available) .
J0927+39 .
3C84 .
J0958+65 .
Comments.
refant: Ef; phase corrections within a few degrees for the calibrators, a bit larger for 3C84 on long baselines and the phase-reference source; 7 pages per source

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
M82: pdf (not available) , or text file (not available) , or statistical summary (not available) .
J0927+39: pdf , or text file , or statistical summary .
3C84: pdf , or text file , or statistical summary .
J0958+65: pdf , or text file , or statistical summary .
Comments.
Hn: low gains in all subbands and polarizations; other gains look fine; 7 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.
Jb: jump in gain at ~19:00-20:00 UT in IF2/RCP; Da: spike in gain at ~17:00 UT; Hn: a few outliers; sources at very low elevation at start of Mk and end of Sc => high gains; 7 pages

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
M82 (not available) .
J0927+39 .
3C84 .
J0958+65 .
Comments.
closure phases clustered around zero; few outliers; J0958+65: no plots with Mc or Mk (no data in the first ~2 hours), plots with Jb and Kp stop early (~06:00 UT and ~12:30 UT, respectively); 94-112 pages per source

Calibrated visibilities and the source model of:
M82 (not available) .
J0927+39 .
3C84 .
J0958+65 .
Comments.
very good agreement between data and models; a few bad scans in individual subbands/polarizations in Jb, Mc, Da, Kp, and Br; 16 pages per source

Calibrated visibilities against u,v distance for:
M82: pdf , or png .
J0927+39: pdf , or png .
3C84: pdf , or png .
J0958+65: pdf , or png .
Comments.

u,v coverage for:
M82: pdf , or png .
J0927+39: pdf , or png .
3C84: pdf , or png .
J0958+65: pdf , or png .
Comments.

Crude maps of sources:
M82: pdf , or FITS .
J0927+39: pdf , or FITS .
3C84: pdf , or FITS .
J0958+65: pdf , or FITS .
Comments.