#acl hermelo,CarstenKramer,NicolasBillot,SamuelLeclerc,GismoTeam:read,write,delete,revert,admin Default

= GISMO Data Reduction =


<<TableOfContents(3)>>

'''[[ http://www.iram.es/IRAMES/mainWiki/Continuum/GISMO/Main | Go back to the GISMO Main Wiki ]]'''

== Basic reduction ==

To reduce GISMO data with crush, first log into your project account:

{{{
ssh -X 078-13@mrt-lx2.iram.es     
}}}

Raw data are stored in the directory ~/observationData/gismo. The scans are stored in a filing hierarchy, organised by source name, then an IRAM scan ID composed of a UT calendar date and a scan number. For example, the scan 113 taken on 2013-04-12 of NGC4449 is stored as:

{{{
~/observationData/gismo/NGC4449/2013-04-12.113/NGC4449_2013-04-12.113_gismo.fits}}}

To reduce this scan with crush, type in your terminal:

{{{
crush gismo -default                           \
            -datapath=~/observationData/gismo  \ 
            -object=NGC4449                    \
            -date=2013-04-12 113               \
            -outpath=~/crush_reduction         \
            -name=NGC449
}}}

It is possible to add several scans:

{{{
crush gismo -default                           \
            -datapath=~/observationData/gismo  \ 
            -object=NGC4449                    \
            -date=2013-04-12 113-116 120       \
            -date=2013-04-13 1-6               \
            -outpath=~/crush_reduction         \
            -name=NGC4449
}}}

and also to combine different source-names:

{{{
crush gismo -default                           \
            -datapath=~/observationData/gismo  \
            -object=NGC4449                    \
            -date=2013-04-12 113-116 120       \
            -object=NGC4449-N                  \
            -date=2013-04-14 21-23             \
            -outpath=~/crush_reduction         \
            -name=NGC4449
}}}

== Filtering options ==

Just replace '''-default''' by one of the following options:

||  '''-deep'''  || deep fields when the most aggressive filtering of common mode is done ||
||'''-extended'''|| for structures larger than the field-of-view                          ||
|| '''-faint'''  || faint sources (S/N<10)                                                ||
|| '''-bright''' || bright sources (S/N>1000)                                             ||

You may also want to use combinations like e.g. '''-faint -extended'''. 

Don't forget that Attila Kovacs wrote good [[http://www.submm.caltech.edu/~sharc/crush/document.html| CRUSH documentation]]. 

== Skydip reduction ==

{{{
crush gismo -skydip                            \
            -skydip.elRange=25:50              \
            -datapath=~/observationData/gismo  \
            -object=TipCurrentAzimuth          \
            -date=2013-04-26 99                \
            -outpath=~/crush_reduction         \
            -name=skydip.2013.04.26.99
}}}
-----

Author: Israel Hermelo (IRAM 30m continuum pool manager)

email: hermelo@iram.es
 
Created: 2013.10.25

Last update: 2013.10.25