VS08F Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Richard Dodson
Date Prepared: 21-10-2003
 

Summary
 
Observation code : VS08F    AIPS Version : 31DEC03   
Date of Observation : 1998/163    Difmap Version : 2.4a 
Source Name : J1937-3958    vsop_difmap used : No 
Calibration Source(s) : 1921-293         
Ground telescopes : HH SH  Model Fitted to data : Yes 
Tracking Station(s) : TZ GZ    Image made : No 
Correlator : Penticton         

 
Abstract
A mess - hardly any over lap between the two GRTs. Big jumps in delay (including space baselines). A patchy fring was required. However the PLS model fits where it touches.
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
0.415978 0.0159198 145.016 0.204857 1.00000 0.00000 0.4837
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


AIPS Data Reduction Notes
 
Task
Adverbs
CL
in
SN
in
CL
out
SN
out
Comments
FITLD clint = 0.25
digicor = -1
delcorr = -1
 
 
 
 
  
INDXR cparm = 0, 0, 0.25;
 
 
1 
 
  
ANTAB infile='antab.txt'
 
 
 
 
  
APCAL
 
 
 
1 
  
CLCAL refant=1;
1 
1 
2 
 
 Amplitude calibration solutions applied. SH as ref 
TACOP ine 'cl'
2 
 
3 
 
  
CLCOR opcode 'gain';antenna 0;clcorprm
   0.9055*1.19,0
opcode 'sbdl';ant 2 0;clcorprm
   -2070 -2070 0
ant 1 0;clcorprm 750 750
   0;timer 0 0 0 0 0 19 0
ant 1 0;clcorprm -140,-140
   0;timer 0 19 0 0 0 23 0
3 
 
3 
 
  
FRING search 2 3; dparm 2,100,50,0.5,0;dparm(7)=1;solint
   10
dparm 2,200,100,0.5,0;
solint 15;dparm
   2,130,60,0.5,0,0,1,0
3 
 
 
13,14,16 
 V. import not to rereference. Noisey to Halca. 
SNEDT/SNSMO bparm 0 0 0.5;cparm 0 0 0.5
   0.5 0 0 0 10 10 0
 
16 
 
17,18 
 The smoothed version is rubbish 
CLCAL refant=3;
3 
17 
4 
 
  
FRING dparm 2 20 10 0.5 0 0 1 0;solint
   10;
4 
 
 
19 
 Scatter around zero 
CALIB refant=3;
4 
20 
 
 
  
CLCAL refant=3;
4 
20 
5 
 
  
SPLIT aparm(1)=2 0;
5 
 
 
 
 Av within IF 
FITTP
 
 
 
 
 Data written out for analysis in Difmap 

AIPS Input Files
ANTAB.TXT
 Comments
- None -

AIPS Output Files
PRTAN.LIS
LISTR.LIS
DTSUM_0.LIS
DTSUM_1.LIS
UVPLT_UV.PS
UVPLT_UVD.PS
UVPLT_UVPA.PS
SN_APCAL_AMP_2.PS
SN_APCAL_AMP_1.PS
SN_FRING1_DEL_1.PS
SN_FRING1_DEL_2.PS
SN_FRING1_RAT_1.PS		 SN_FRING1_RAT_2.PS
SN_FRING1_SNR_1.PS
SN_FRING1_SNR_2.PS
SN_FRING2_DEL_1.PS
SN_FRING2_DEL_2.PS
SN_FRING2_RAT_1.PS
SN_FRING2_RAT_2.PS
SN_FRING2_SNR_1.PS
SN_FRING2_SNR_2.PS
SN_FRING3_DEL_1.PS
SN_FRING3_DEL_2.PS
SN_FRING3_RAT_1.PS		 SN_FRING3_RAT_2.PS
SN_FRING3_SNR_1.PS
SN_FRING3_SNR_2.PS
SN_CALIB_DEL_1.PS
SN_CALIB_DEL_2.PS
SN_CALIB_RAT_1.PS
SN_CALIB_RAT_2.PS
SN_CALIB_SNR_1.PS
SN_CALIB_SNR_2.PS
SN_CALIB_PHA_1.PS
SN_CALIB_PHA_2.PS


Difmap Data Reduction Notes
Phase selfcal applied? No
Global amplitude selfcal (gscal) applied? No
Amplitude selfcal on non-global timescales used? No
Modelfit made and saved? Yes
Image Made and saved? No
Comments on Difmap processing
Phase calibration done in AIPS (to few baselines - usually 2). Long baselines imply some resolving point source ~ 0.2 mas.

Consistent with the PLS values, but no overlap. Second PLS component too weak to be detected. Model does not fit well.

1921-29 looks fine: 3.4 Jy source.

Modelfit
Ampl, Phase vs (u,v) Distance
PS (33 kb)
JPEG (47 kb)
 Ampl, Phase vs Time
PS (104 kb)
JPEG 1, 2		 (u,v) Coverage
PS (18 kb)
JPEG (27 kb)
Closure Phase vs Time
PS (62 kb)
JPEG 1		 Image with model components
PS (30 kb)
JPEG (36 kb)

More details on the Images and Modelfits are found in this page.

Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
0.415978 0.0159198 145.016 0.204857 1.00000 0.00000 0.4837
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Tue Aug 24 07:24:52 GMT 2004
by db_results.pl version 0.3.