ALMA Observation Support Tool

Version 4.0

The ALMA Cycle 4 Call for Proposals is now ended. Thank-you to all the OST users this CfP and good luck with your proposals! - OST Team
Array Setup:
Select the desired ALMA antenna configuration.
Sky Setup:
Source model:  
Choose a library source model or supply your own.
You may upload your own model here (max 10MB).
Ensure correct formatting of this string (+/-00d00m00.0s).
Image peak / point flux in 
Rescale the image data with respect to new peak value.
Set to 0.0 for no rescaling of source model.
Observation Setup:
Observing mode: Spectral Continuum
Spectral or continuum observations?
Central frequency in GHz:
The value entered must be within an ALMA band.
Bandwidth in  :
Select the total bandwidth for continuum observations.
Enter 7.5 GHz to select ALMA recommend full continuum setup.
Use recommended continuum setup? : No Yes
Position spectral windows at the ALMA recommended positions for 7.5GHz bandwidth continuum observations.
SPW 0: BW 0:
SPW 1: BW 1:
SPW 2: BW 2:
SPW 3: BW 3:
Set the central frequency and bandwidth of each baseband/SPW in GHz.
SPWs can only be placed within the grey shaded areas.
They will be truncated in the simulation if not.
More SPWs (up to SPW3) will become avaiable as you increase the total bandwidth.
Use full Stokes parameters: Yes No
If your input image contains more than one Stokes plane
use them all (Yes), or just Stokes I (no/default).
Channel width in  :
The width of channels to simulate.
Number of polarizations:
This affects the noise in the final map. Ignored in continuum mode if "Use full Stokes parameters" is set to yes.
Required resolution in arcseconds:  
OST will choose array config based on this value if instrument is set to ALMA.
Pointing strategy:  
Selecting single will apply primary beam attenuation.
On-source time in 
Per pointing for mosaics.
Start hour angle:  
Deviation of start of observation from transit.
Number of visits:  
How many times the observation is repeated.
Include cycling to phase calibrator?: Yes No
This affects the uv-coverage of your simulation.
Phase Cycle: seconds
The length of time between cutting to a phase calibrator.
Limited to either 0s or between 300s and 600s.
On Phase Cal. time: seconds
The length of time spent observing phase calibrator (including slewing time).
Currently limited to either 0s or between 30s and 120s.
Atmospheric Corruption:
Atmospheric conditions:
Determines level of noise due to water vapour.
Imaging Product:
Imaging weights:
This allows a resolution / sensitivity trade-off.
Perform deconvolution?:
Apply the CLEAN algorithm to deconvolve the image.
Output image format:
CASA format images are returned as a tar file
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