README web version of /home/usg/OPS/MTS/readme_xml/readme_84005900

Principal Investigator Email Address

• benne.holwerda@gmail.com

Estimated Total Execution Time (hours, including overheads)

• 01:10:40.000

General Description

• This program targets a distant occulting galaxy pair with VLT/VIMOS in
   IFU mode. The observations are in a single observing block (I cannot seem to delete
   the other one). Three exposures with arc and flat calibrations at the end. The total
   exposure and execution times are 42:30 and 1:10:40 respectively. A waiver to exceed
   the 1 hour and 5 minutes length of an OB has been obtained to fit the whole 1.2
   hours awarded to this program in this single OB.
  
  We did not specify any offsets as the goal is to intercompare spectra withing the
   FOV of the IFU (from either side of the object) and any effects of the sky will
   be calibrated out. We also anticipate to have several fibers in which there is only
   sky and no signal from the object.
  The object is small (< 27") so we opt for the lower spatial resolution (0.67"
   per resolution element) to fully cover it with the IFU in Medium resolution mode.
   This will give us several fibers right next to the object for possible sky calibration.
  
  A DSS finding chart is included. It shows the position of the object relative to
   the chosen guide star and the nearby galaxy NGC 253. The object itself is in the
   guide star catalog (but it is not a star!). We provided the position of a possible
   guide star.
  
  384.B-0059A.jpg - large finding DSS chart, NGC 253. 
  
  These observations are follow-up on HST observations of this object. The HST pictures
   can be found here: 
  http://heritage.stsci.edu/2008/33/index.html

Waiver Requests

• A waiver request to extend the OB to 1.2 hours was granted by ESO

Critical Observing Condition Constraints

• A seeing of 1" or better would greatly facilitate the comparison with
   HST data.

Time-Critical Aspects

• There are no time-critical aspects to this OB.

Special Execution Requirements

• There are no special execution requests.

Special Calibration Information

• There are no Special Calibtation Information. The arcs at the end of the
   OB are to calibrate for wavelength.

ToO Information

• This is not a target of opportunity (neither variable not moving).

ToO Activators List

• Intentionally left blank.

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• None

Do all your OBs comply with the instrument-specific requirements listed
 on the instrument-specific Phase 2 web page ?

• YES

If this is a pre-imaging run, did you select PRE-IMAGING for the Observing
 Category for each Observing Template ?

• N/A

Do all your finding charts comply with both the general and instrument-specific
 Phase 2 Web Pages ?

• YES

If you submitted OBs for standard stars, did you specify the magnitude
 and spectral type of all standard stars in the OBs ?

• N/A

Have you included OBs for any calibrations that you need but which are
 not part of the Calibration Plan ?

• YES

If you are observing Moving Targets, have you attached suitable ephemeris
 files to your OBs?

• N/A

If you have preferences which OBs should be executed first, did you make
 use of the User Priority field in the OBs ?

• YES

If this is a run that requires coordinated observations with other facilities,
 did you give proper instructions in the Time-Critical Aspects Section ?

• N/A

Did you specify suitable guide stars for all your OBs using Guidecam
 ?

• YES

Did you check that the chosen guide stars are suitable for all the offset
 positions and that they do not produce unacceptable vignetting of the field of view
 ?

• YES