TWHydraBand7 Calibration for CASA 3.3
From CASA Guides
- This script assumes that you have downloaded RawDataAndTablesForReduction from TWHydraBand7#Getting_the_Data
- Details of the ALMA data are provided at TWHydraBand7
Observing Log and Priors
External info
# In CASA
data=['X3c1.ms','X5d8.ms','X7ef.ms']
for vis in data:
listobs(vis=vis,verbose=F)
Below we copy select parts of the listobs output reported in the CASA logger for reference.
X3c1.ms: Data records: 278352 Total integration time = 6109.06 seconds Observed from 22-Apr-2011/00:01:52.9 to 22-Apr-2011/01:43:42.0 (UTC) X5d8.ms: Data records: 278406 Total integration time = 5995.01 seconds Observed from 22-Apr-2011/01:48:05.8 to 22-Apr-2011/03:28:00.8 (UTC) X7ef.ms: Data records: 255717 Total integration time = 5407.49 seconds Observed from 22-Apr-2011/03:30:39.7 to 22-Apr-2011/05:00:47.2 (UTC) ID Code Name RA Decl Epoch SrcId 0 none 3c279 12:56:11.1666 -05.47.21.5247 J2000 0 1 none Titan 00:00:00.0000 +00.00.00.0000 J2000 1 2 none TW Hya 11:01:51.9063 -34.42.17.0212 J2000 2 3 none J1147-382=Q* 11:47:01.3815 -38.12.11.1179 J2000 3 4 none J1037-295=Q* 10:37:16.0899 -29.34.02.9888 J2000 4 SpwID Chans Frame Ch1(MHz) ChanWid(kHz)TotBW(kHz) Ref(MHz) Corrs 0 4 TOPO 184550 1500000 7500000 183300 I 1 128 TOPO 355740.062 15625 2000000 355732.25 XX YY 2 1 TOPO 356716.625 1796875 1796875 355732.25 XX YY 3 128 TOPO 356507.813 15625 2000000 356500 XX YY 4 1 TOPO 357484.375 1796875 1796875 356500 XX YY 5 128 TOPO 346792.187 15625 2000000 346800 XX YY 6 1 TOPO 345784.375 1796875 1796875 346800 XX YY 7 128 TOPO 345182.438 15625 2000000 345190.25 XX YY 8 1 TOPO 344174.625 1796875 1796875 345190.25 XX YY 9 128 TOPO 344386.763 15625 2000000 344394.575 XX YY 10 1 TOPO 343378.95 1796875 1796875 344394.575 XX YY 11 128 TOPO 346324.263 15625 2000000 346332.075 XX YY 12 1 TOPO 345316.45 1796875 1796875 346332.075 XX YY 13 128 TOPO 354402.388 15625 2000000 354394.575 XX YY 14 1 TOPO 355378.95 1796875 1796875 354394.575 XX YY 15 128 TOPO 356402.388 15625 2000000 356394.575 XX YY 16 1 TOPO 357378.95 1796875 1796875 356394.575 XX YY 17 3840 TOPO 356497.936 122.070312 468750 355732.25 XX YY 18 1 TOPO 356732.189 468750 468750 355732.25 XX YY 19 3840 TOPO 357734.314 122.070312 468750 356500 XX YY 20 1 TOPO 357499.939 468750 468750 356500 XX YY 21 3840 TOPO 346034.314 122.070312 468750 346800 XX YY 22 1 TOPO 345799.939 468750 468750 346800 XX YY 23 3840 TOPO 343955.936 122.070312 468750 345190.25 XX YY 24 1 TOPO 344190.189 468750 468750 345190.25 XX YY ID= 0-3: 'DV04'='J505', 'DV06'='T704', 'DV07'='J510', 'DV08'='T703', ID= 4-7: 'DV09'='N602', 'DV10'='N606', 'PM01'='T702', 'PM02'='T701', ID= 8-8: 'PM03'='J504'
Examine Tsys and WVR Tables, Apply, and Split
# In CASA
FDM=[17,19,21,23]
FDMtables=['X3c1.tsys.fdm','X5d8.tsys.fdm','X7ef.tsys.fdm']
plotrange=[0,0,50,500]
antennas='1,2,3,4,5,6,7,8]
for caltable in FDMtables:
for spw in FDM:
plotcal(caltable=caltable,xaxis='freq',yaxis='amp',
iteration='antenna',subplot=421,poln='',spw='%d'%spw,antenna=antennas,
showgui=F,figfile='FDM%d_%s.png'%(spw,caltable),fontsize=8.0,
plotrange=plotrange)
# In CASA
data=['X3c1.ms','X5d8.ms','X7ef.ms']
fdm='17,19,21,23'
sources=['0','1','2','4']
nocal='3' # This source had no Tsys measurements associated with it
For sources with Tsys measurements apply only to themselves
# In CASA
for vis in data:
for field in sources:
applycal(vis=vis,spw=fdm,field=field,gainfield=field,
gaintable=['%s.tsys.fdm'%(vis.split('.')[0]),'wvr_%s.cal'%(vis.split('.')[0])],
interp=['nearest','nearest'],flagbackup=F)
For sources without Tsys, couple them with best source with Tsys
# In CASA
for vis in data:
applycal(vis=vis,spw=fdm,field=nocal,
gaintable=['%s.tsys.fdm'%(vis.split('.')[0]),'wvr_%s.cal'%(vis.split('.')[0])],
gainfield=['4',nocal],interp=['nearest','nearest'],flagbackup=F)
Check Tsys application
# In CASA
plotms(vis='X5d8.ms',spw='17,19,21,23',xaxis='frequency',yaxis='amp',field='0,1',
avgtime='1e8',avgscan=T,coloraxis='field',ydatacolumn='data')
spw 19 with atmospheric absorption gets a strange upward hitch probably from the interpolation from TDM
# In CASA
for vis in data:
split(vis=vis,outputvis='%s_wvrtsys.ms'%(vis.split('.')[0]),datacolumn='corrected',spw=fdm)
Initial Inspection and Flagging
# In CASA
data=['X3c1_wvrtsys.ms','X5d8_wvrtsys.ms','X7ef_wvrtsys.ms']
for vis in data:
flagdata(vis=vis,autocorr=True, flagbackup=T)
flagdata(vis=vis,mode='shadow',diameter=12.0, flagbackup=F)
flagdata(vis=vis,antenna='DV04', flagbackup=F)
# In CASA
plotms(vis='X3c1_wvrtsys.ms',spw='',xaxis='time',yaxis='amp',field='',avgchannel='3840',
coloraxis='field',iteraxis='spw')
# In CASA
plotms(vis='X5d8_wvrtsys.ms',spw='',xaxis='time',yaxis='amp',field='',avgchannel='3840',
coloraxis='field',iteraxis='spw')
# In CASA
plotms(vis='X7ef_wvrtsys.ms',spw='',xaxis='time',yaxis='amp',field='',avgchannel='3840',
coloraxis='field',iteraxis='spw')
In spw2 there are some low points. Locate suggests YY and PM03. Switch to coloraxis='corr'
# In CASA
plotms(vis='X3c1_wvrtsys.ms',spw='2',xaxis='time',yaxis='amp',field='',avgchannel='3840',
coloraxis='corr')
To further check remove PM03 from the plot.
# In CASA
plotms(vis='X3c1_wvrtsys.ms',spw='2',xaxis='time',yaxis='amp',field='',avgchannel='3840',
coloraxis='corr',antenna='!PM03')
Unzoom does not work, but flip to next page and back does.
# In CASA
data=['X3c1_wvrtsys.ms','X5d8_wvrtsys.ms','X7ef_wvrtsys.ms']
for vis in data:
flagdata(vis=vis, flagbackup=T,
spw=['2'],
antenna=['PM03'],
correlation=['YY'])
Check phase / delay
# In CASA
plotms(vis='X3c1_wvrtsys.ms',spw='',xaxis='frequency',yaxis='phase',field='0',antenna='DV06',
avgtime='1e8',avgscan=T,coloraxis='baseline',iteraxis='spw',xselfscale=T)
# In CASA
plotms(vis='X5d8_wvrtsys.ms',spw='',xaxis='frequency',yaxis='phase',field='0',antenna='DV06',
avgtime='1e8',avgscan=T,coloraxis='baseline',iteraxis='spw',xselfscale=T)
# In CASA
plotms(vis='X7ef_wvrtsys.ms',spw='',xaxis='frequency',yaxis='phase',field='0',antenna='DV06',
avgtime='1e8',avgscan=T,coloraxis='baseline',iteraxis='spw',xselfscale=T)
Now look for birdies
Titan and 3C279
# In CASA
plotms(vis='X3c1_wvrtsys.ms',spw='',xaxis='frequency',yaxis='amp',field='0,1',
avgtime='1e8',avgscan=T,coloraxis='field',iteraxis='spw',xselfscale=T)
TW Hydra and Phase cals
# In CASA
plotms(vis='X3c1_wvrtsys.ms',spw='',xaxis='frequency',yaxis='amp',field='2,3,4',
avgtime='1e8',avgscan=T,coloraxis='field',iteraxis='spw',xselfscale=T,yselfscale=T)
Quick check that other two datasets are the same
Titan and 3C279
# In CASA
plotms(vis='X5d8_wvrtsys.ms',spw='',xaxis='frequency',yaxis='amp',field='0,1',
avgtime='1e8',avgscan=T,coloraxis='field',iteraxis='spw',xselfscale=T)
# In CASA
plotms(vis='X7ef_wvrtsys.ms',spw='',xaxis='frequency',yaxis='amp',field='0,1',
avgtime='1e8',avgscan=T,coloraxis='field',iteraxis='spw',xselfscale=T)
TW Hydra and Phase cals
# In CASA
plotms(vis='X5d8_wvrtsys.ms',spw='',xaxis='frequency',yaxis='amp',field='2,3,4',
avgtime='1e8',avgscan=T,coloraxis='field',iteraxis='spw',xselfscale=T,yselfscale=T)
birdies seem weaker, some gone
# In CASA
plotms(vis='X7ef_wvrtsys.ms',spw='',xaxis='frequency',yaxis='amp',field='2,3,4',
avgtime='1e8',avgscan=T,coloraxis='field',iteraxis='spw',xselfscale=T,yselfscale=T)
Change to channel space to get channels for flagging
TW Hydra and Phase cals
# In CASA
plotms(vis='X3c1_wvrtsys.ms',spw='',xaxis='channel',yaxis='amp',field='2,3,4',
avgtime='1e8',avgscan=T,coloraxis='field',iteraxis='spw')
# In CASA
data=['X3c1_wvrtsys.ms','X5d8_wvrtsys.ms','X7ef_wvrtsys.ms']
for vis in data:
flagdata(vis=vis, flagbackup=T,
spw=['0:1067~1068;1279~1280;2367~2368;3775~3776',
'1:1279~1280;2367~2368;3775~3776',
'2:1279~1280;3775~3776',
'3:831~832;1535~1536;2367~2368;3775~3776;3839~3839'])
Force reload and check that flagging has been done as anticipated.
Concatenate the Data
Here we will concatenate the three datasets for convience. WARNING: it is not always safe to do this [explain].
data=['X3c1_wvrtsys.ms','X5d8_wvrtsys.ms','X7ef_wvrtsys.ms'] concat(vis=data,concatvis='Band7multi_april22.ms')
listobs(vis='Band7multi_april22.ms',verbose=F)
SpwID #Chans Frame Ch1(MHz) ChanWid(kHz)TotBW(kHz) Ref(MHz) Corrs
0 3840 TOPO 356497.936 122.070312 468750 355732.25 XX YY 1 3840 TOPO 357734.314 122.070312 468750 356500 XX YY 2 3840 TOPO 346034.314 122.070312 468750 346800 XX YY 3 3840 TOPO 343955.936 122.070312 468750 345190.25 XX YY
