README web version of /home/usg/OPS/MTS/readme_xml/readme_76019700

Principal Investigator Email Address

• frederic.courbin@epfl.ch

Estimated Total Execution Time (hours, including overheads)

• 9.0

General Description

• This is the continuation of our spectrophotometric monitoring of the Einstein
   cross, with the VLT and FORS1. The goal is to take spectra of the four components
   of the lensed quasar (seeing strictly < 1"), and to deconvolve the data using
   the spectra of PSF stars in order to remove the spectrum of the lensing galaxy and
   study the spectra of the quasar images alone. *** Good aligment of the mask is critical
   for the success of the project. Please check that the object is centered as in the
   finding chart, as well as the PSF stars. Clipped PSFs are a problem.
  
  We send 6 epochs, with two masks per epoch. The epochs are separated by about 15
   days
  (sometimes 1 months when no service runs are planned with FORS1).
  
  http://obswww.unige.ch/~eigenbro/Q2237.html
  
  gives the ideal observing dates (+ see the range of dates in the "time interval"
   in the OBs), given the moon illumination and moon distance. We have tried to put
   our prefered date during planned service mode runs, as scheduled on the ESO pages.
  Please tell us if this schedule is modified. We will update our pages regularly.
  
  A key issue is to keep as close as possible to the 15 days sampling and to execute
   the "mask1" and "mask2" OBs of the same epoch on the same night or on two consecutive
   nights max. It is also very important to start the observations as early as possible
   in the period. April would be great, even at high airmass.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• The constraint set only reflects the *average* acceptable weather conditions.
  The ideal situation would be to have most data taken with seeing
  STRICTLY BELOW 1 arcsec (0.9 is fine), with some exceptions with seeing
  of 1.00 1.05, but no more.
  
  Observations with conditions slightly worse than those specified are still acceptable
   in exceptional cases --> we prefere getting good temporal sampling and good temporal
   coverage in conditions slightly off the ideal, rather than always excellent weather
   conditions but sparce sampling. This should however be applied *only* if one or
   several
  epochs have been missed due, e.g. to very bad weather.

Time-Critical Aspects

• This is a monitoring program, with the goal of taking 1 observing point
   per period of 15 days. See :
  
  http://obswww.unige.ch/~eigenbro/Q2237.html
  
  for optimal time observation dates (2 masks per epoch).

Special Execution Requirements

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Special Calibration Information

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ToO Information

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ToO Activators List

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Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

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Source(s) of Pre-imaging

• FORS1 after 03/03

Pre-imaging sources not listed above

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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 ?

• N/A

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 ?

• N/A

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

If you have prepared your finding charts with tools other than FIMS,
 do they comply with the specifications on the FORS1 Phase 2 web page ?

• N/A