README web version of /home/usg/OPS/MTS/readme_xml/readme_81050800

Principal Investigator Email Address

• vmotta@dfa.uv.cl

Estimated Total Execution Time (hours, including overheads)

• 10h

General Description

• The goal of this proposal is to obtain low resolution spectra of lensed
   quasar pairs. The comparison of the emission lines and continuum between lensed
   QSO images would give us information about microlensing due to stars present in
   the lens galaxy.
  
  We prepare one OB for each lens system. Each OB has the name of the gravitational
   lens system and the pair of images to be observed. The target coordinates usually
   correspond to the brightest QSO image (e.g. A) and it is stated in the target name.
  
  We attached two finding charts for each target. The first finding chart is the one
   required by ESO, containing the FORS FOV (15'x15'). The second finding chart is
   an HST image in V-band of the multipy imaged QSO that includes the labeling for
   each of the QSO images.
  
  The position angles were calculated in a way to get pairs of images in the slit.
   It is important that both images fall inside the slit. 
  
  The Calibration Plan already take into account what we need to calibrate our data
   (bias, arc, flats and a standard star with 5" slit).

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• Critical conditions are: seeing equal or better than 0.8 arcsec, dark/grey
   night, and clear or thin atmospheric condition.
  Good seeing allow us to separate lensed QSO images. The other two conditions are
   required to obtain S/N=40 in the spectra.
  We estimated the exposure time using VLT ETC and the following parameters: seeing=0.8
   arcsec, airmass=1.6, 10 days from new Moon.

Time-Critical Aspects

• None.

Special Execution Requirements

• The OB list has no order or preference, however some of the lensed QSO
   are too faint, i.e. we need more than 1 OB to achieve S/N=40. Thus, in the cases
   of SDSS0924 and RXJ1131, we prefer the completion of each set of OBs before moving
   to another target.

Special Calibration Information

• ---(Empty)---

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• ---(Empty)---

Source(s) of Pre-imaging

• ---(Empty)---

Pre-imaging sources not listed above

• ---(Empty)---

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 ?

• YES