[daip] CLCOR bug?
Amy Mioduszewski
amiodusz at aoc.nrao.edu
Thu Jun 28 13:29:32 EDT 2001
I am trying to correct a position of a source in an experiment of
mine with CLCOR. I then subtracted the correction and the RAAPP and
DECAPP in the SU table where what they were originally but the RAEPO
and the DECEPO where different. Here are the inputs for CLCOR (I am
doing this for a rather larger shift than I really want so you can
actually see the sift with the limited significant digits that PRTAB
shows):
AIPS 2: CLCOR Task which applies various corrections to CL tables.
AIPS 2: Adverbs Values Comments
AIPS 2: ----------------------------------------------------------------
AIPS 2: INNAME 'BR058B 18CM ' Input UV file name (name)
AIPS 2: INCLASS 'CLCOR ' Input UV file name (class)
AIPS 2: INSEQ 1 Input UV file name (seq. #)
AIPS 2: INDISK 2 Input UV file disk unit #
AIPS 2: SOURCES 'J0422+5324 ' Source list ' '=>all.
AIPS 2: *rest ' '
AIPS 2: STOKES ' ' Stokes type to process
AIPS 2: SELBAND -1 Bandwidth to select (kHz)
AIPS 2: SELFREQ -1 Frequency to select (MHz)
AIPS 2: FREQID 1 Freq. ID to select, 0=>all
AIPS 2: BIF 0 Lowest IF number 0=>all
AIPS 2: EIF 0 Highest IF number 0=>all
AIPS 2: TIMERANG *all 0 Time range to use.
AIPS 2: ANTENNAS *all 0 Antennas to correct.
AIPS 2: SUBARRAY 0 Subarray; 0 => 1.
AIPS 2: GAINVER 16 CL table version to update
AIPS 2: OPCODE 'ANTP' Operation code.
AIPS 2: CLCORPRM 0 0 Parameters (see HELP CLCOR).
AIPS 2: 0 0 0.36 0.18
AIPS 2: *rest 0
AIPS 2: BADDISK *all 0 Disks to aviod for scratch
Prior to the correction using PRTAB to print the interesting columns:
BR058B 18CM .CLCOR . 1 Disk= 2 SU Table version 1
Title: AIPS UV DATA FILE SOURCE TABLE
Created by UVCOP on 24-APR-2001 12:44:11
Last written by UVCOP on 28-JUN-2001 10:44:00
Ncol 19 Nrow 3 Sort cols:
Table has 4 keyword-value pairs:
NO_IF = 4
VELTYP = GEOCENTR
VELDEF = OPTICAL
FREQID = 1
Table format incompatable with FITS ASCII tables
COL. NO. 2 11 12 14
15
ROW SOURCE RAEPO DECEPO RAAPP
DECAPP
NUMBER DEGREES DEGREES DEGREES
DEGREES
1 J0419+5722 6.483089E+01 5.738333E+01 6.478838E+01
5.737507E+01
2 CICAM 6.492557E+01 5.599936E+01 6.488398E+01
5.599116E+01
3 J0422+5324 6.568500E+01 5.340729E+01 6.564481E+01
5.339930E+01
After running CLCOR I get this from PRTAB
BR058B 18CM .CLCOR . 1 Disk= 2 SU Table version 1
Title: AIPS UV DATA FILE SOURCE TABLE
Created by UVCOP on 24-APR-2001 12:44:11
Last written by CLCOR on 28-JUN-2001 10:51:05
Ncol 19 Nrow 3 Sort cols:
Table has 4 keyword-value pairs:
NO_IF = 4
VELTYP = GEOCENTR
VELDEF = OPTICAL
FREQID = 1
Table format incompatable with FITS ASCII tables
COL. NO. 2 11 12 14
15
ROW SOURCE RAEPO DECEPO RAAPP
DECAPP
NUMBER DEGREES DEGREES DEGREES
DEGREES
1 J0419+5722 6.483089E+01 5.738333E+01 6.478838E+01
5.737507E+01
2 CICAM 6.492557E+01 5.599936E+01 6.488398E+01
5.599116E+01
3 J0422+5324 6.568531E+01 5.340730E+01 6.564498E+01
5.339935E+01
After running with CLCORPRM 0 0 0 0 -0.36 -0.18:
BR058B 18CM .CLCOR . 1 Disk= 2 SU Table version 1
Title: AIPS UV DATA FILE SOURCE TABLE
Created by UVCOP on 24-APR-2001 12:44:11
Last written by CLCOR on 28-JUN-2001 10:56:33
Ncol 19 Nrow 3 Sort cols:
Table has 4 keyword-value pairs:
NO_IF = 4
VELTYP = GEOCENTR
VELDEF = OPTICAL
FREQID = 1
Table format incompatable with FITS ASCII tables
COL. NO. 2 11 12 14
15
ROW SOURCE RAEPO DECEPO RAAPP
DECAPP
NUMBER DEGREES DEGREES DEGREES
DEGREES
1 J0419+5722 6.483089E+01 5.738333E+01 6.478838E+01
5.737507E+01
2 CICAM 6.492557E+01 5.599936E+01 6.488398E+01
5.599116E+01
3 J0422+5324 6.568514E+01 5.340725E+01 6.564481E+01
5.339930E+01
As you can see the RAAPP and DECAPP are the same as before the first PRTAB
output but
RAEPO and DECEPO are are different and the difference is big at VLBA scales.
Amy
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