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Simple Image
SUSI_img_obs_Exposure

P2PP panel with typical parameters

In the above example after a simple preset, we take an unwindowed, 1x1 binned (see parameter CCD binning) V image of 200 seconds, followed by an R image of 100 seconds.

Simple Images
SUSI_img_obs_Exposures

P2PP panel with typical parameters

The above example is almost exactly the same as before. In this case, however, after a simple preset, we take 5 unwindowed, 1x1 binned (see parameter CCD binning) V images of 200 seconds, followed by 5 unwindowed, 1x1 binned R images of 100 seconds.

Jittered Imaging
SUSI_img_obs_Jitter

• Number of Exposures how many exposures do you want of this field?
• List of Exposure Times Specify the exposure times for your images. You can specify a single exposure time, or a list of exposure times. The template will cycle through the exposure times listed here until the Number of Exposures is reached
  
• Return to Original Preset Flag do you want the telescope to return to the original position after each complete jitter pattern?
  
  • This should be set to true if you want to perform the same dither patter with more than 1 filter inside the same OB. Otherwise, the dither pattern of the 2nd filter will start at the last dither position of the first filter.
• List of telescope RA offsets/List of telescope DEC offets here you define the offsets you would like the telescope to take in order to create your jitter pattern. Note: The offsets are cumulative! The template will cycle through the offsets listed here until the Number of Exposures is reached
  
• Filter what filter would you like to observe in?

P2PP panel with example parameters

The above example shows an OB comprising a sequence of:

• An aquisition template for a simple preset
• The remaining images are taken unwindowed and with 2x2 binning
• Take 4 jittered exposures of 5 seconds, 10 seconds, 5 seconds and 10 seconds through the V filter. The telescope is offset by +10 arcsec in RA and DEC before the first exposure is taken. It is then offset by -20 arcsec in RA and DEC for the 2nd exposure, +10 arcsec in RA and DEC for the 3rd exposure, and -20 arcsec in RA and DEC for the 4th exposure (i.e. it cycles through both the exposure times and the offsets until the number of exposures is finished). The telescope then returns to the original preset position after dither sequence is finished since the Return to Original Preset Flag is checked
• Take 4 jittered exposures of 5 seconds, 10 seconds, 15 seconds and 20 seconds respectively through the R filter. The telescope is offset by +10 arcsec in RA and DEC before the first exposure is taken. It is then offset by -20 arcsec in RA and DEC for the 2nd exposure, +5 arcsec in RA and DEC for the 3rd exposure, and +20 arcsec in RA and DEC for the 4th exposure. The telescope does not return to the original preset position after dither sequence is finished since the Return to Original Preset Flag is not checked
• The telescope remains at the last position of the previous set of images. It has not returned to the preset origin. The OB now takes 10 jittered exposures of 60 seconds each in the I filter. The telescope is offset by +10 arcsec in RA and DEC before the first exposure is taken. It is then offset by -20 arcsec in RA and DEC for the 2nd exposure and this pattern is repeated (+10, -20) until the number of exposures has been taken (i.e. it cycles through both the exposure times and the offsets until the number of exposures is finished). The telescope then returns to the original preset position after dither sequence is finished since the Return to Original Preset Flag is checked

Fast Photometry
SUSI_img_obs_DoubleW

This template is similar to the SUSI_img_obs_Exposures template in that it takes multiple images of an object without dithering. However, in this template you can define 2 non-overlapping windows (you can only define one window in SUSI_img_obs_Exposures) that can be read out very quickly. This is useful mainly for Fast Photometry.

P2PP panel with example parameters

The above example shows an OB comprising an aquisition template for a simple preset. Once on position, SUSI2 is divided up into two user-defined windows. The first window (perhaps for a variable object) is 500x500 pixels in size, and begins at pixel (500,500). The second window (perhaps for a calibration star) is 200x200 pixels in size, and begins at pixel (1500,1300). The chip is binned 2x2 and we are taking 500 x 2 second exposures with this setup in the V filter.

Send comments to : ls-susi Last modified: Thu Jul 31 2003