EVN User Experiment Pipeline Feedback


Pipeline feedback for experiment RP001. If you have any comments on this experiment please email the address below.
A detailed description of the pipeline output is available.

Last updated: Wed May 24 18:42:41 CEST 2006 zparagi@jive.nl

General Comments. ( Brief data summary and scan listing )
C-band e-VLBI experiment observed on 18-19 May 2006 (weeks before session 2/2006). The recording rate was 128 Mbps with two bit sampling. There were 2x8 MHz subbands in both polarizations; crosspols were also produced. The fringe finders were OQ208, J1925+2106 and J2002+4725. The target source was phase-referenced to J2007+4029 in 3-5-3 minute cycles.
The participating telescopes were Cm, Jb, Mc, On, Tr, and Wb. All produced good data and fringes. There was a Mark5A problem in Jodrell Bank between ~3-7 UT - data were lost. The real nature of the problem was spotted late by the correlator support scientist. Some data (~10%) were lost during correlation job restarts. This was only included in the ERI estimate, not in ERI*.

The EVN reliability indicator (ERI) for this experiment was ERI = 0.697 . ERI* = 0.893 . (Cm=0.9/1.0, Jb=0.6/0.7, Mc=0.9/1.0, On=0.9/1.0, Tr=0.9/1.0, Wb=0.9/1.0)

Plots of the autocorrelations
Comments.
Weak RFI in Jodrell L2. The Wb and Cm phasecals were maybe a bit too strong.

plots of the uncalibrated amplitude and phase against time
Comments.
Jb: lost data between ~3-7 UT (see general notes above).
Wb: sources were at a too low elevation between ~21:30-22:15

Plots of the uncalibrated amplitude and phase against frequency channel
Comments.
Wb-Cm phasecals correlate somewhat, as apparent on these scalar averaged plots. Note that the major delay rate ~0 danger zones had been flagged prior making the fits file. Some harmonics are still affecting the data. The effect is negligible when the data are properly averaged (i.e. vector averaged).

The uncalibrated amplitude and phase of the crosshand correlations against frequency channel
Comments.

TSYS against time
Comments.

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.
On and Wb were apparently less sensitive than expected. See the EVN Status Table).

Fringe-fit phase solutions (including Parallactic Angle correction).
Comments.
Phases quickly wrapping around 22 UT. This was because fringes were not propoerly re-referenced to Westerbork, the reference antenna in the pipeline. (Wb did not see the sources around 22 UT).

Fringe-fit delay solutions
Comments.

Fringe-fit rate solutions
Comments.
Cm had a rather high residual rate (~5 mHz).

Telescope bandpasses
Comments.
Should not have used Wb as refant for bandpass calibration!

Calibrated amplitude and phase against time (a priori amplitude calibration and fringe-fit solutions applied).
Comments.

Calibrated amplitude and phase against frequency channel
Comments.

Naturally weighted dirty map (not useful for bright sources) produced before self-cal of:
OQ208: pdf (not available) , or FITS (not available) .
J1925+2106: pdf (not available) , or FITS (not available) .
J2002+4725: pdf (not available) , or FITS (not available) .
J2007+4029: pdf (not available) , or FITS (not available) .
CYGX-3: pdf , or FITS .
Comments.

Uniformly weighted dirty map (not useful for bright sources) produced before self-cal of:
OQ208: pdf (not available) , or FITS (not available) .
J1925+2106: pdf (not available) , or FITS (not available) .
J2002+4725: pdf (not available) , or FITS (not available) .
J2007+4029: pdf (not available) , or FITS (not available) .
CYGX-3: pdf , or FITS .
Comments.

Phase corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
OQ208 .
J1925+2106 .
J2002+4725 .
J2007+4029 .
CYGX-3 (not available) .
Comments.

Amplitude corrections applied to a priori calibrated and fringe-fitted data by self-calibration.
OQ208: pdf , or text file , or statistical summary .
J1925+2106: pdf , or text file , or statistical summary .
J2002+4725: pdf , or text file , or statistical summary .
J2007+4029: pdf , or text file , or statistical summary .
CYGX-3: pdf (not available) , or text file (not available) , or statistical summary (not available) .
Comments.
On: about 20% corrections in amplitude.
Wb: 20-30% corrections in amplitude.

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.
Onsala sensitivity is as expected (after self-calibrating the gains).
Wb was less sensitive than expected (probably due to the bad weather). See the EVN Status Table).

Residual closure phase (visibility closure phase with model closure phase subtracted) for:
OQ208 .
J1925+2106 .
J2002+4725 .
J2007+4029 .
CYGX-3 (not available) .
Comments.

Calibrated visibilities and the source model of:
OQ208 .
J1925+2106 .
J2002+4725 .
J2007+4029 .
CYGX-3 (not available) .
Comments.

Calibrated visibilities against u,v distance for:
OQ208: pdf , or png .
J1925+2106: pdf , or png .
J2002+4725: pdf , or png .
J2007+4029: pdf , or png .
CYGX-3: pdf , or png .
Comments.

u,v coverage for:
OQ208: pdf , or png .
J1925+2106: pdf , or png .
J2002+4725: pdf , or png .
J2007+4029: pdf , or png .
CYGX-3: pdf , or png .
Comments.

Crude maps of sources:
OQ208: pdf , or FITS .
J1925+2106: pdf , or FITS .
J2002+4725: pdf , or FITS .
J2007+4029: pdf , or FITS .
CYGX-3: pdf , or FITS .
Comments.