VS04r Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: William Scott
Date Prepared: 26-09-2000
 

Summary
 
Observation code : VS04r    AIPS Version : 15Apr99   
Date of Observation : 1998/21    Difmap Version : 2.3c 
Source Name : J1246-25    vsop_difmap used : Yes 
Calibration Source(s) : 1213-17         
Ground telescopes : Hh, Ho, Mp, Se, Ud  Model Fitted to data : Yes 
Tracking Station(s) : GZ, TZ, NZ    Image made : Yes 
Correlator : Penticton         

 
Abstract
Note: This experiment was originally analyzed September 11/1999.
Model
Flux (Jy)
Radius (mas)
Theta (deg)
Major (mas)
Axial ratio
Phi (deg)
TB (10^12 K)
0.871625 0.0524700 45.7274 0.222691 1.00000 -33.4737 0.8577
(*) 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 DIGICOR=DELCOR=-1
 
 
 
 
 Output file name = VS04R.FITLD 
MSORT
 
 
 
 
 Input file name = VS04R.FITLD, Output file name = VS04R.UVSRT 
INDXR CPARM(1)=3
CPARM(3)=0.25
 
 
 
 
 Created NX(1) 
TABED
 
 
 
 
 Copied FG(1-7) -> FG(8) 
IBLED
 
 
 
 
 added edits to FG(8) 
UVFLG
 
 
 
 
 editted out Sh IF 2...added flagging to FG(8) 
FIXWT IF=1
CHAN=100
XINC=10
 
 
 
 
  
INDXR CPARM(1)=3
CPARM(3)=0.25
 
 
1 
 
 Deleted CL(1) and NX(1), then reran INDXR since number of input vis != number of output vis after running FIXWT 
ANTAB
 
 
 
 
 Had Tsys values for all GRTs! For Halca, had to extrapolate tsys values from experiment VS05s (obs date Dec 21/87). Used a nominal DPFU value of 0.1 for Hobart. For other antennas, had non-nominal gain curves. 
APCAL
 
1 
 
 
 Input: Ty(1) + GC(1) 
SNSMO Interpol=MWF
Smotype=AMPL
BPARM(1)=1 (window width
   = 1 hour)
 
1 
 
2 
  
CLCAL OPCODE = CALI
INTERPOL = '2PT'
1 
2 
2 
 
  
TBOUT INEXT = 'AN'
 
 
 
 
  
TBIN
 
 
 
 
 Changed MNTSTA entries in the AN table. Changed Halca from 3 to 2, and changed Ho and Ht to 0. 
FRING DOCALIB 1
GAINUSE 2
SOLINT 2
TIMER 0 20 50 0 0 20 55 0
REFANT 6 (Usuda 64m)
APARM(7)=4 (SNR=4)
APARM(9)=1
DPARM(1)=1 (no baseline
   stacking)
DPARM(3)=100 (100mHz rate
   window)
DPARM(4)=0.5 (0.5 sec integration
   time)
CALSOUR='1213-172'
FLAGVER -1 (as all 1213-172
   was
inadvertantly flagged out)
2 
 
 
3 
 No solutions found... hence don't bother using 1213-172 as a manual FRING calibrator. Only baselines 1-4 and 5-6 had any 1213-172 data anyhow. 
FRING DOCALIB 1
GAINUSE 2
SOLINT 2
TIMER 0 21 30 0 0 21 35 0
REFANT 6 (Usuda 64m)
APARM(7)=4 (SNR=4)
APARM(9)=1
DPARM(1)=1 (no baseline
   stacking)
DPARM(3)=100 (100mHz rate
   window)
DPARM(4)=0.5 (0.5 sec integration
   time)
2 
 
 
3 
 Result: Low SNR solutions... not sure I trust them 
FRING DOCALIB 1
GAINUSE 2
SOLINT 5
TIMER 0 21 30 0 0 21 35 0
REFANT 6 (Usuda 64m)
APARM(7)=4 (SNR=4)
APARM(9)=1
DPARM(1)=1 (no baseline
   stacking)
DPARM(3)=100 (100mHz rate
   window)
DPARM(4)=0.5 (0.5 sec integration
   time)
2 
 
 
3 
 Not enough memory. 
FRING DOCALIB 1
GAINUSE 2
SOLINT 3
TIMER 0 19 5 0 0 19 10 0
REFANT 6 (Usuda 64m)
APARM(7)=4 (SNR=4)
APARM(9)=1
DPARM(1)=1 (no baseline
   stacking)
DPARM(3)=100 (100mHz rate
   window)
DPARM(4)=0.5 (0.5 sec integration
   time)
2 
 
 
3 
 Results look good for all GRTs except Hh. Hh did not observe until 0 20 40. Note, all prior SN(3)s were deleted after their unsuccessful FRING attempt. 
TBOUT INEXT = 'SN'
INVER=3
 
3 
 
 
  
TBIN
 
 
 
3 
 Removed the rate solutions and made sure there was only one solution for each antenna (except Hh, for which there was no solutions.) Also had to renumber the rows. 
CLCAL OPCODE = CALP
INTERPOL = '2PT'
REFANT 6 (Usuda 64m)
2 
3 
3 
 
  
FRING DOCALIB 1
GAINUSE 3
SOLINT 5
BCHAN 20
ECHAN 220
REFANT 6 (Usuda 64m)
APARM(7)=4 (SNR=4)
APARM(9)=1
DPARM(1)=1 (no baseline
   stacking)
DPARM(2)=2000
DPARM(3)=100 (100mHz rate
   window)
DPARM(4)=0.5 (0.5 sec integration
   time)
3 
 
 
4 
 Result: Good except for... 1) Bad Sh solutions 2) Bad solutions after 0:22 3) Bad solns from approx: 0:20:45 --> 0:21:5 Deleted SN(4) 
UVFLG TIMER 0:20:45:59 0:21:5:20
BIF=0
EIF=0
ANT=0
 
 
 
 
 editted FG(8) when scans jumped between: J1246-25 and 1213-172 
FRING DOCALIB 1
GAINUSE 3
SOLINT 5
BCHAN 20
ECHAN 220
CALSOUR 'J1246-25'
REFANT 6 (Usuda 64m)
SEARCH 3,1 (realized in prev.
   FRINGes was set to 1)
APARM(7)=4 (SNR=4)
APARM(9)=1
DPARM(1)=1 (no baseline
   stacking)
DPARM(2)=0
DPARM(3)=100 (100mHz rate
   window)
DPARM(4)=0.5 (0.5 sec integration
   time)
3 
 
 
4 
  
SNEDT
 
4 
 
5 
 Editted inconsistent delays. All Sh solns after approx. 0:19:50 were flagged 
CLCAL OPCODE='CALI'
REFANT 6
3 
5 
4 
 
  
TACOP
4 
 
5 
 
  
CLCOR OPCODE 'GAIN'
ANTENNAS 2 (Hobart)
CLCORPRM 0.5
4 
 
5 
 
 Correction due to comparing crossing points using DIFMAP. 
TACOP
5 
 
6 
 
  
CLCOR OPCODE 'GAIN'
ANTENNAS 2
CLCORPRM 1.33
6 
 
6 
 
 PLS data observed ago 1.5 years ago, and nearly simultaneous AT light curve data imply zero spacing flux should be about 1.18 Jy. Instead, Difmap radplot gives zero-spacing flux of about 0.66Jy. Multiply all antennas by 1.33 increase VSOP data to this level. 
CLCOR OPCODE 'GAIN'
ANTENNAS 3 (Mopra)
CLCORPRM 0.60
6 
 
6 
 
 Using an amp self-cal result from imaging with Difmap 
CLCOR OPCODE 'GAIN'
ANTENNAS 6 (Usuda)
CLCORPRM 1.18
6 
 
6 
 
 Using an amp self-cal result from imaging with Difmap 
SPLIT SOURCES 'J1246-25'
DOCALIB 1, GAINUSE 6
APARM(1)=2 (average each
   IF separately)
6 
 
 
 
 Input file: VS04R.FIXWT, Output file: J1246-25.FITS 
FITTP
 
 
 
 
 Input file: J1246-25.FITS, Output file: J1246-25.FITS amplitude 

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

AIPS Output Files
DTSUM_0.LIS
DTSUM_1.LIS
LISTR.LIS
PRTAN.LIS
POSSM01_AP_1.PS
POSSM02_AP_1.PS
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		 UVPLT_UV.PS
UVPLT_UVD.PS
UVPLT_UVPA.PS
VPLOT_AP_1.PS
VPLOT_AP_2.PS
WEIGHTS.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? Yes
Image Made and saved? Yes
Comments on Difmap processing
Editted out Mp-* (both IFs) >21:15 (Mp antenna stowed itself) For Sh < 19:50, approx. half the data and was flagged. In an initial run of Difmap, compared crossing points with Uvplot/Vplot: 1) Ha-Hh @22:21:30 approx. 0.2 Jy Ha-Ho @21:25:30 approx. 0.6 Jy 2) Ha-Ud @19:27:30 approx. 0.3 Jy Ha-Ho @20:40:30 approx. 0.7 Jy Ha-Mp @20:26:30 approx. 0.5 Jy This led to the CLCOR correction for Ho. After amp self-cal, Mp was also high and Ud was lowish....so corrected these with CLCOR, reran Difmap again. In final Difmap, ran amp+phase self-cal down to 10 minute solint.

Image
Ampl, Phase vs (u,v) Distance
PS (53 kb)
JPEG (44 kb)
 Ampl, Phase vs Time
PS (238 kb)
JPEG 1, 2, 3		 (u,v) Coverage
PS (28 kb)
JPEG (29 kb)
Closure Phase vs Time
PS (328 kb)
JPEG 1, 2		 Clean Image
PS (43 kb)
JPEG (47 kb)
Modelfit
Ampl, Phase vs (u,v) Distance
PS (53 kb)
JPEG (43 kb)
 Ampl, Phase vs Time
PS (238 kb)
JPEG 1, 2, 3		 (u,v) Coverage
PS (28 kb)
JPEG (29 kb)
Closure Phase vs Time
PS (327 kb)
JPEG 1, 2		 Image with model components
PS (40 kb)
JPEG (40 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)
0.871625 0.0524700 45.7274 0.222691 1.00000 -33.4737 0.8577
(*) Quoted Brightness temperatures assume Gaussian components and are in the local (z=0) frame.


Last updated on Wed May 23 05:35:36 GMT 2001
by db_results.pl version 0.3.