VS03l Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Zsolt Paragi
Date Prepared: 21-06-1999
 

Summary
 
Observation code : VS03l    AIPS Version : 15APR99   
Date of Observation : 1998/53    Difmap Version : 2.3c 
Source Name : J1626-29    vsop_difmap used : No 
Calibration Source(s) : 1622-297         
Ground telescopes : Hobart, Shanghai, Hartebeesthoek  Model Fitted to data : No 
Tracking Station(s) : TZ    Image made : Yes 
Correlator : Penticton         

 
Abstract
Strong finges for HALCA up to ~23:30, weak fringes/no detection afterwards. The calibrator source cannot be used for amplitude calibration as only two station observed 1622-297. The standard Difmap program was used for imaging. Data processing/imaging was done in cooperation with Sandor Frey at the Satellite Geodetic Observatory, Hungary.


AIPS Data Reduction Notes
 
Task
Adverbs
CL
in
SN
in
CL
out
SN
out
Comments
FITLD douvcomp = 1
doconcat 1
digicor = -1
delcorr = -1
 
 
 
 
  
MSORT sort 'tb'
 
 
 
 
  
INDXR cparm = 0, 0, 0.5, 0
 
 
1 
 
 Input file was extracted from the PI letter. 
ANTAB
 
 
 
 
 Gain curve information from VSOP calibration web page. Measured Tsys values were used for ground stations. "Guess" Tsys values were used for HALCA based on experience (96.5, 101.5). 
APCAL
 
 
 
1 
  
CLCAL
1 
1 
2 
 
 Amplitude calibration solutions applied 
TACOP
2 
 
3 
 
  
CLCOR optype 'sbdl'
antennas 2 0; clcorprm -440,
   -440;
antennas 3 0; clcorprm 2080,
   2080;
antennas 4 0; clcorprm 1850,
   1850;
3 
 
3 
 
 Delay offsets from DQA plots. #--------------------------------------------------------- 
KRING docalib = 1
gainuse = 3
search = 3, 2, 1
solmode = 'SBD'
bparm(5) = 0.5
cparm = 0, 0, 2, 1000, 200,
   5, 5, 0, 0
antwt = 0
3 
 
 
2, 3, 4, 5 
 Several attempts to find fringes with 2-4 minute solution times. SNR limit was not applied at the end. We seemed to find fringes, however, POSSM plots showed only noise for most of the baselines (especially for HALCA). After careful checking of the KRING message files we realized that solutions were "corrupted" in the LS cycle. Test runs with FRING and the previous version of KRING (15OCT98) showed that KRING 15APR99 gives the delay and rate value for HALCA with the wrong sign. This bad value cause the problems in the LS step. (Results for two test runs can be found in SN.8 and SN.9. These were created with KRING version 15OCT98 and 15APR99, respectively. Input parameters were the same.) 
FRING docalib = 1
gainuse = 3
flagver = 1
search = 3, 1, 2
solmode = 'SBD'
bparm(5) = 0.5
cparm = 0, 0, 2, 500, 200,
   1, 4, 0, 1, 0
solint = 3
3 
 
 
6 
 There were solutions not passed because of the SNR limit. No solutions after ~23:30. 
FRING docalib = 1
gainuse = 3
flagver = 1
search = 3, 2, 1
solmode = 'SBD'
bparm(5) = 0.5
cparm = 0, 0, 2, 500, 200,
   1, 2.8, 0, 1, 0
solint = 3
3 
 
 
7 
 Accept solutions without editing. 
CLCAL
3 
7 
4 
 
  
TACOP
4 
 
5 
 
  
CLCOR opcode='gain'
antennas = 0
clcorprm=0.906, 0
 
 
5 
 
  
SPLIT aparm 2 0.5 0 1 0
5 
 
 
 
  
FITTP
 
 
 
 
 Data written out for analysis in Difmap 

AIPS Input Files
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		 UVPLT_UV.PS
SN_FRING01_RAT_1.PS
SN_FRING01_RAT_2.PS
SN_FRING01_SNR_1.PS
SN_FRING01_SNR_2.PS
UVPLT_UVD.PS
UVPLT_UVPA.PS


Difmap Data Reduction Notes
Phase selfcal applied? Yes
Global amplitude selfcal (gscal) applied? Yes
Amplitude selfcal on non-global timescales used? Yes
Modelfit made and saved? No
Image Made and saved? Yes
Comments on Difmap processing
Note: WTSCAL 100000 was used. HALCA corrections cannot be compared directly with other's results because they probably used other Tsys values.

! Performing overall amplitude self-cal ! Adding 25 model components to the UV plane model. ! The established model now contains 144 components and 1.63881 Jy ! ! Correcting IF 1. ! A total of 390 telescope corrections were flagged in sub-array 1. ! Telescope amplitude corrections in sub-array 1: ! HARTRAO 1.03 HOBART 0.85 SESHAN25 0.96 VSOP_SC 1.19 ! ! ! Correcting IF 2. ! A total of 369 telescope corrections were flagged in sub-array 1. ! Telescope amplitude corrections in sub-array 1: ! HARTRAO 1.02 HOBART 0.87 SESHAN25 1.01 VSOP_SC 1.13 ! ! ! Fit before self-cal, rms=0.199282Jy sigma=1.437637 ! Fit after self-cal, rms=0.192177Jy sigma=1.146442

Image
Ampl, Phase vs (u,v) Distance
PS (93 kb)
GIF (9 kb)
 Ampl, Phase vs Time
PS (318 kb)
GIF 1, 2		 (u,v) Coverage
PS (49 kb)
GIF (5 kb)
Closure Phase vs Time
PS (178 kb)
GIF 1		 Clean Image
PS (33 kb)
GIF (66 kb)


Last updated on Fri Jul 2 00:33:34 GMT 1999
by db_results.pl version 0.2.0.