GISMO Data Reduction
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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=NGC449It 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=NGC4449and 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 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