README web version of /home/usg/OPS/MTS/readme_xml/readme_79058800

Principal Investigator Email Address

• georges.meylan@epfl.ch

Estimated Total Execution Time (hours, including overheads)

• 2.8 h

General Description

• (1) Brief Explanation for Our Observation: This is H-band NACO LGS imaging
   of 4 gravitationally lensed quasars. The targets are 2 systems with 4 lensed images
   (PG1115+080, J1131-123) and 2 systems with 2 lensed images (SDSS1353+1138 and SDSS
   0806+2006).  OBs consist of 1 Science OB per target (with S27 camera and H-band
   filter) with AO loop performed *on target* for targets PG1115+080, J1131-1231 and
   on a nearby star for SDSS 0806+2006 and SDSS1353+1138. The goal of the proposal
   is to test the feasability of closing the loop directly on targets with such complex
   morphology and test the subsequent image quality (i.e. is it improved or not compared
   to "nearby" tip tilt star). 
  The easiest target should be (in decreasing order of easiness) 1) PG1115+080, 2)
   J1131-1231, 3) SDSS 0806+2006, 4) SDSS1353+1138. (2) Requirement for Our Observation:
    For each target, the OB has to be observed under CLEAR conditions at airmass <
   1.6 (<1.8 for SDSS 0806+2006 and SDSS1353+1138). The targets are expected to
   be at the center of the FOV for the first observation of the OB. Offsets of +/-6
   arcsec w.r.t. original position (7 arcsec for J1131-1231) are performed between
   each exposure in order to perform subsequent reasonable sky subtraction. Following
   discussion with USD-help, we have used "disk" morphology for the tip-tilt reference
   star (when the later is the Target) in JN preparation software (i.e. to construct
   and aocfg file and the ETC input file). To be conservative, we have used DIT of
   120s that enables us not to saturate (peak=1/5 of saturation) even if A.O. corrected
   PSF is better then predictions and airmass is 1.0. However if for any reason saturation
   was occuring, the support astronomer is free to reduce the DIT.  (3) Properties
   of Our Science Targets:  H-band mag. of the brightest component of our science targets
   are as follows, PG1115+080:  15.7; J1131-1231: 15.8; SDSS1353+1138: 14.6 ; SDSS
   0806+2006: 16.5.
  The brightest object in the FOV is the target or never brighter than H=14.0

Waiver Requests

• No Waiver Request was submitted
  Due to carry-over of the proposal two targets have been changed (i.e. WFI2033-4723
   and WFI2026-4536 have been replaced by SDSS1353+1138 and SDSS 0806+2006)

Critical Observing Condition Constraints

• There is no critical time constraint for our observations

Time-Critical Aspects

• Only visibility issues: PG1115+080 is observable at airmass < 1.6 from
   January up to end of June, J1131-1231 is observable at airmass < 1.6 from January
   up to beigning of July.
  SDSS0806+2006 is observable until mid May and 1353+1138 is both observable from
   mid Feb up to end of July.

Special Execution Requirements

• No Special Calibration

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 ?

• 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

If you have PSF reference star OBs, do the names of those OBs begin with
 PSF_ ?

• N/A

If there are Finding Charts attached to your OBs, is the field-of-view
 of at least one of these charts 2' x 2' (with clearly labelled field orientation)
 ?

• YES

Have you clearly marked and labelled your wavefront reference objects
 R1, R2, R3, ... (as specified in the NAOS Preparation Software) on your Finding
 Charts ?

• N/A

Have you specified the magnitude of the brightest object in the field-of-view
 for each OB ?

• N/A

Are there objects in any of your fields (including standard stars) which
 are brighter than the limits specified in the User Manual and on NACO web Pages
 ?

• NO

If the previous answer is yes, have you given a list of OBs and a justification
 for the brightness limit violation in the general description field ?

• N/A