README web version of /home/usg/OPS/MTS/readme_xml/readme_81008004

Principal Investigator Email Address

• dominique.sluse@epfl.ch

Estimated Total Execution Time (hours, including overheads)

• 0.3 h

General Description

• (1) Brief explanation: this is a pre-imaging programme to prepare spectro-photometric
   monitoring observations of the gravitationally lensed quasar J1131-1231 (Programme
   181.0080(A)) in MXU mode.
  The MXU slits will contain the three brightest images of the main target (J1131-1231)
   as well as several reference/field stars (that will be used for deconvolution purposes).
   The latter are not identified on the finding charts because they will be selected
   based on their effective brightness on the pre-imaging images.
  (2) Requirement for Our Observation:  The OB has to be observed under CLEAR conditions
   at airmass < 1.6  and seeing ~ 0.8". The main target (J1131-1231) is expected
   to be located at the center of the FOV (i.e. in the MASTER chip of the FORS 2 camera,
   at about 260 pixels from the gap between the 2 chips = default settings) for the
   first observation of the OB. Offsets w.r.t. original position are performed between
   each exposure to ensure problems due to bad pixels, observations of the objects
   in the gap between the 2 chips, and of stars located at the border of the field.
   The main target should be visible on each exposure.
  (3) Properties of Our Science Target: The brightest components of the lens (=main
   target) have a V magnitude between 17.9-19. The other potential targets are the
   field stars with similar or brighter magnitude than the target (i.e. 15.5 mag <
   R < 20 mag). The exposure time (30s) has been chosen in order to measure accurately
   the position of the field stars with R~15.5 (i.e. not saturate them) and also have
   images of the main target (J1131-1231) with enough S/N.

Waiver Requests

• Waiver ID: 181.B-0080A.01  has been accepted (01.16.08; Bodo Zieger) in
   order to obtain observations in bin 1x1 mode instead of standard bin 2x2 for both
   pre-imaging and future science observations (runs 181.B-0080(A) and 181.B-0080(E))

Critical Observing Condition Constraints

• Too good seeing conditions (i.e. <0.7 arcsec) should be avoided (due
   to saturation of the brightest field stars). 
  The requested seeing constraint (0.8") is optimal for these observations.

Time-Critical Aspects

• Should be observed as soon as possible in order to prepare the Phase II
   material for MXU observations quickly

Special Execution Requirements

• ---(Empty)---

Special Calibration Information

• ---(Empty)---

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Is this a Pre-imaging run ?

• true

Pre-imaging Requirements

• This is a Pre imaging program

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 ?

• YES

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