VS09t Results
Submitted checklist.txt and checklist.tex is also available		   [Summary | AIPS | Difmap ]
Analyst: Zhi-Qiang Shen
Date Prepared: 20-10-1999
 

Summary
 
Observation code : VS09t    AIPS Version : 15OCT98 
Date of Observation : 1998/215    Difmap Version : 2.3c 
Source Name : J1540+14    vsop_difmap used : Yes 
Calibration Source(s) : 1741-038         
Ground telescopes : Hart, GBank  Model Fitted to data : No 
Tracking Station(s) : UZ,TZ    Image made : No 
Correlator : Mitaka         

 
Abstract
No fringes were detected to Halca during both UZ and TZ passes. The reason for UZ pass probably was related to the resolution effect. But for TZ pass which had shorter ground-space baselines than ground-ground, the reason was not clear. As a result, there was only one baseline (GBank-Hart) of 10,000km, on which fringes were good for both survey source (J1540+14) and calibrator (1741-038). The correlated flux densities were about 0.15Jy and 1.0Jy for J1540+14 and 1741-038, respectively. This is much lower than PLS result of 1.0Jy at about 8,000Km for J1540+14. (The PLS result for 1741-038 was 2.0Jy at 8,000km). So, the lower flux density for J1540+14 cannot be fully explained by the antenna gain loss. Also, UMRAO database shows little variation for J1540+14 during the observations.

This is cited from the note to the observations: ``Replaced vs09a. ... HALCA observed vs09a?'' Maybe there were pointing errors?

A re-scheduling is recommended.


AIPS Data Reduction Notes
 
Task
Adverbs
CL
in
SN
in
CL
out
SN
out
Comments
FITLD douvcomp=1
dotable=1
 
 
 
 
 load the uv FITS data 
MSORT sort='TB'
 
 
 
 
 sort the data to 'TB' order 
INDXR cparm(3)=1
 
 
1 
 
 index uv data with 1 min CL entry interval 
TACOP
1 
 
2 
 
 protect CL1 
ACCOR solint=0
 
 
 
1 
 correct amplitudes in cross correlation spectrum 
SNSMO smotype='ampl';bparm=0.05,0
 
1 
 
2 
 smooth the amplitude correction SN1 
CLCAL opcode='CALI'
interpol=' '
refant=1
2 
2 
3 
 
 apply smoothed ACCOR solution SN2 
ANTAB
 
 
 
 
 determine the Tsys and gain curve, 95K for Halca 
APCAL opcode=' '
 
 
 
3 
 generate an amplitude calibration solution table 
CLCAL opcode='CALI';interpol=';refant=1
3 
3 
4 
 
 apply amplitude calibration solution 
FRING docalib=1;refant=1;solint=4
aparm=2,0,0,0,0,1,5,0
dparm=1, 0
4 
 
 
4 
 run FRING with an SNR cutoff=5. no fringes to Halca. try lower cutoff (SNR=3), still no detection on Halca. 
CLCAL opcode='CALI';smotype='VLBI'
refant= 1
cals=sour='J1540+14'
(cal=sour='1741-038')
4 
4 
5 
 
 apply FRING solutions 2 times (once for each source) 
TASAV
 
 
 
 
 copy all extension tables to a dummy file 
SPLIT docalib=1;douvcomp=1
aparm=2,0,0,1,0
5 
 
 
 
 make calibrated single-source data J1540+14.SPLIT and 1741-038.SPLIT 
FITTP
 
 
 
 
 export each single-source file in FITS format to disk file for further imaging analysis 

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_ACCOR_AMP_1.PS		 SN_ACCOR_AMP_2.PS
SN_APCAL_AMP_1.PS
SN_APCAL_AMP_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
POSSM01_AP_1.PS
POSSM01_AP_2.PS
VPLOT_AP_1.PS
VPLOT_AP_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? No
Image Made and saved? No
Comments on Difmap processing



Last updated on Wed Oct 27 21:14:43 GMT 1999
by db_results.pl version 0.2.0.