vs01j Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Philip Edwards
Date Prepared: 06-10-2005
 

Summary
 
Observation code : vs01j    AIPS Version : 31dec02 
Date of Observation : 2001/254    Difmap Version : 2.3c 
Source Name : j0522-36    vsop_difmap used : Yes 
Calibration Source(s) : j0403-36, j0423-01, j0811+01         
Ground telescopes : CD, MP, MK  Model Fitted to data : No 
Tracking Station(s) : TZ    Image made : No 
Correlator : Penticton         

 
Abstract
This is a data extraction from w603a. A 4 hour segement with three GRTs and one tracking pass were extracted from the full data set for fringe-fitting. Many of the files contain the full GOT data, as this the full GOT was fringefit for amp scale checks (and as it was not initially clear which was the best time range to extract). HO failed throughout (possibly due to crossed pols), and MP probably wind-stowed for almost three hours, leading to selection of 17UT to 21UT for the survey obs.

A three circular-gaussian modelfit provides a decent fit on all but the shortest HALCA baselines. The best-fit core is 0.63 Jy component with a size of 0.35 mas. The error on the core size is estimated to be less than +/- 0.05, as cores of that size provide noticeably worse fits on the longest HALCA baselines.


AIPS Data Reduction Notes
 
Task
Adverbs
CL
in
SN
in
CL
out
SN
out
Comments
FITLD
 
 
 
 
 load three files from disk 
INDXR cparm=0,0,0.5
 
 
 
 
  
PRTAN
 
 
 
 
  
LISTR optype='scan'
 
 
 
 
  
DTSUM aparm=0
 
 
 
 
  
UVPLT timer 0 17 0 0 0 21 0 0,
    antenn 1,5,6,7, xinc=100,
   bparm 6,7,2
 
 
 
 
  
ANTAB infil 'INP:w603a.cal
 
 
 
 
 gains from VSOP web page and VLBA ftp site. nominal tsys for MP, all others from logs 
APCAL
 
 
 
 
  
CLCAL opcode='cali', interpol='ambg'
   refant 6
1 
1 
 
 
  
FRING
 
 
 
 
  
CLCAL
 
 
 
 
  
SPLIT
 
 
 
 
  
FITTP
 
 
 
 
  

AIPS Input Files
Comments
- None -

AIPS Output Files
PRTAN.LIS
LISTR.LIS
DTSUM_0.LIS
UVPLT_UV.PS		 SN_ACCOR_1.PS
SN_CALIB_DEL_1.PS
SN_CALIB_SNR_1.PS
POSSM_AP_1.PS		 VPLOT_AP_1.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? No
Image Made and saved? No
Comments on Difmap processing
HALCA weight set to 20 with vs_whalca. Gscale not used as too much data would have been flagged. Imaging of calibrators indicates no serious errors in gain cal for GRTs. Three component circ. gaussian model doesn't match shorter-baseline HALCA data brilliantly, but a better fit could not be found.



Last updated on Wed Jul 26 17:23:33 UTC 2006
by db_results.pl version 0.3.