README web version of /home/usg/OPS/MTS/readme_xml/readme_84076200

Principal Investigator Email Address

```
georges.meylan@epfl.ch
```

Estimated Total Execution Time (hours, including overheads)

```
23.5h
```

General Description

(1) Brief Explanation for Our Observation: This is NACO LGS S27 imaging
 of 4 gravitationally lensed quasars. The targets are HE0047-1740, SDSS0924+0219,
 PG1115+080, J1131-1231.

AO correction performed *on target* for targets PG1115+080, J1131-1231 and on "nearby"
 stars for HE0047-1740 and SDSS0924+0219. All the tip-tilt stars are >40'' from
 the targets. We are aware that this config. leads to small Strehl Ratios but only
 improvement of the PSF is needed for our program.


(2) Properties of Our Science Targets:  H-band mag. of the brightest component of
 our science targets are as follows, HE0047-1740: 15.0; SDSS0924+0219: 18.0; PG1115+080:
 15.7; J1131-1231: 15.8 ; The brightest object in the FOV is the target or is never
 brighter than H=14.0

Following discussion with USD-help, we have used \"disk\" morphology for the tip-tilt
 reference star ( when the later is the Target) in JNPS (i.e. to construct and aocfg
 file and the ETC input file). We have checked with ETC that even with airmass=1,
 peak intensity < 1/5 NACO saturation. However, if for any reason, saturation
 was occurring, the support astronomer should reduce the DIT.

Waiver Requests

```
No Waiver Request was submitted
```

Critical Observing Condition Constraints

There is no critical time constraint for our observations

Time-Critical Aspects

Only visibility issues: 
HE0047-1740 is observable at airmass < 1.6 until January
PG1115+080 and J1131-1231 are observable at airmass < 1.6 from January till end
 of P84. 
SDSS0924+0219 is observable during full P84

Special Execution Requirements

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No Special Calibration
```

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

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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 ?

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 ?

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 ?

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) ?

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

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 ?

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
```

Last creation of page: Tue Oct 6 15:40:32 2009
If you have comments, please contact usd-help@eso.org