VS08o Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Georgina Coldwell
Date Prepared: 01-07-2002
 

Summary
 
Observation code : VS08o    AIPS Version : 31DEC01   
Date of Observation : 2001/201    Difmap Version : 2.3c 
Source Name : J0126+25    vsop_difmap used : Yes 
Calibration Source(s) : J0204+15         
Ground telescopes : Shanghai, Kalyazin  Model Fitted to data : Yes 
Tracking Station(s) : Green Bank, Usuda    Image made : Yes 
Correlator : Penticton         

 
Abstract
Typical survey dataset with two GRTs (Shanghai+Kalyazin). Calibration was restarted from scratch because the amplitudes were very low due to the FITLD bug present in the 31DEC00 and 31DEC01 versions of AIPS. Kalyazin amplitudes have been scaled up by 3.5 based on previous data reduction experience and comparison with other baselines. In spite of the number of GRTs the uv-coverage was quite good. The image shows an extension to the South that may be real (though suspicious). Contact person for this experiment is Zsolt Paragi (paragi@jive.nl).
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
0.486430 0.0917014 163.055 0 0 0 0.0000
0.129856 1.89162 -175.110 0 0 0 0.0000
(*) 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
 
 
 
 
 Version 'old' (=31DEC99) was used (for this task only). 
FIXWT bchan 1; echan 100;
 
 
 
 
 Note that "flagver -1" was used in each task below this point, otherwise most of Shanghai data would have been lost. 
INDXR infile 'INDXR.TXT'
cparm 0, 0, 0.25, 0
 
 
 
 
  
TABED inext 'an'; inver 1; outver 1
optype 'repl'
aparm 5 0 0 6 0
bcount 2; ecount 2
keyval 2 0
 
 
 
 
 Change incorrect mounting type for HALCA. 
ANTAB tyver 1; gcver 1
infile 'ANTAB.TXT'
 
 
 
 
  
APCAL tyver 1; gcver 1
aparm 0
 
 
 
1 
  
CLCAL
1 
1 
2 
 
  
FRING
 
 
 
2 
 never used 
SNEDT
 
2 
 
3 
 never used 
TACOP
2 
 
3 
 
  
CLCOR antennas 1, 0
opcode 'gain'
clcorparm 3.5, 0
3 
 
3 
 
 Scale up Kalyazin amplitudes by a factor of 3.5 (value from a previous calibration attempt). 
FRING timer 0 22 30 10 0 22 32 50
refant 1; solint 3;
dparm 3, 100, 100, 0.7
aparm 2, 0, 0, 0, 0, 1, 3,
   0, 1
search 1, 3
3 
 
 
4 
 Manual phasecal. 
CLCAL
3 
4 
4 
 
  
FRING timer 0
refant 1; solint 3;
dparm 3, 100, 100, 0.7
aparm 2, 0, 0, 0, 2, 1, 3,
   0, 1
search 1, 3
4 
 
 
5 
 Combined IF solution. 
SNEDT
 
5 
 
6 
  
CLCAL opcode 'cali'; interpol '2pt'
refant 1
4 
6 
5 
 
  
SNSMO smotype 'dela'; interpol
   'box'
cparam 0, 0, 0.25, 0
 
6 
 
7 
 Never used 
SNSMO smotype 'vlbi'; interpol
   'box'
cparam 0, 3, 250, 250, 0
bparam 0, 0.01, 0.1, 0.1, 0
 
6 
 
8 
 Never used 
SNSMO smotype 'vlbi'; interpol
   'MWF'
cparam 0, 5, 350, 350, 0
bparam 0, 0.1, 0.35, 0.35
 
6 
 
9 
  
CLCAL opcode 'cali'; interpol '2pt'
4 
9 
6 
 
  
SPLIT source 'J0126+25'; docalib 1
flagver -1, aparm 2, 0.7,
   0, 1
6 
 
 
 
  
SPLIT source 'J0204+15'; docalib 1
flagver -1, aparm 2, 0.7,
   0, 1
6 
 
 
 
  

AIPS Input Files
ANTAB.TXT
INDXR.TXT		 Comments
- None -

AIPS Output Files
DTSUM_0.LIS
DTSUM_1.LIS
LISTR.LIS
PRTAN.LIS
SN_APCAL_AMP_1.PS
SN_APCAL_AMP_2.PS
SN_CALIB_DEL_1.PS
SN_CALIB_DEL_2.PS
SN_CALIB_PHA_1.PS		 SN_CALIB_PHA_2.PS
SN_CALIB_RAT_1.PS
SN_CALIB_RAT_2.PS
SN_CALIB_SNR_1.PS
SN_CALIB_SNR_2.PS
SN_FRING01_DEL_1.PS
SN_FRING01_DEL_2.PS
SN_FRING01_RAT_1.PS
SN_FRING01_RAT_2.PS		 SN_FRING01_SNR_1.PS
SN_FRING01_SNR_2.PS
UVPLT_UV.PS
UVPLT_UVD.PS
UVPLT_UVPA.PS
POSSM02_AP_1.PS
POSSM02_AP_2.PS


Difmap Data Reduction Notes
Phase selfcal applied? Yes
Global amplitude selfcal (gscal) applied? No
Amplitude selfcal on non-global timescales used? No
Modelfit made and saved? Yes
Image Made and saved? Yes
Comments on Difmap processing
Component to the South is suspicious but may be real because PLS data and USNO X-band image also show extension to the South at similar PA.

Image
Ampl, Phase vs (u,v) Distance
PS (34 kb)
JPEG (46 kb)
 Ampl, Phase vs Time
PS (89 kb)
JPEG 1, 2		 (u,v) Coverage
PS (20 kb)
JPEG (31 kb)
Closure Phase vs Time
PS (47 kb)
JPEG 1		 Clean Image
PS (33 kb)
JPEG (46 kb)
Modelfit
Ampl, Phase vs (u,v) Distance
PS (34 kb)
JPEG (46 kb)
 Ampl, Phase vs Time
PS (89 kb)
JPEG 1, 2		 (u,v) Coverage
PS (20 kb)
JPEG (31 kb)
Closure Phase vs Time
PS (47 kb)
JPEG 1		 Image with model components
PS (33 kb)
JPEG (39 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)
0.486430 0.0917014 163.055 0 0 0 0.0000
0.129856 1.89162 -175.110 0 0 0 0.0000
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Wed Jul 3 20:37:52 GMT 2002
by db_results.pl version 0.3.