README web version of /home/usg/OPS/MTS/readme_xml/readme_81082801

Principal Investigator Email Address

• mari_carmen@earthlink.net

Estimated Total Execution Time (hours, including overheads)

• 6.5

General Description

• Spectro-polarimetry observations of a QSO, SX 55275 (02:25:50.673, -04:21:42.106)
   with the GG435 filter with 2 position angles of the retarder plates, at  0 deg and
   45 deg, to measure linear polarization.
  
  We choose the fast option and divide the observations in 6 OBs, 3 OBs with retarder
   plate at angle = 0 and 3 with retarder plate at angle = 45. For our science goal
   we need at least 1 measurement with two retarder angles, so perform 1 OB with ret.
   plate = 0 and 1 with ret. plate = 45, then go to the next OBs.
  
  The acquisition is done on a reference star (02:25:53.689 -04:22:11.037) using the
   BESSEL_R filter. We request a 3 sec exposure that will yield a S/N = 200 over the
   PSF area and a S/N = 24 at central pixel. The ROT angle = 57.3241 deg will put both
   the reference star and the target on the slit. The reference star is at 53.6 arcsec
   from the target to the South East. The r-band magnitudes are 17.4 and 21.6 for the
   reference star and the target, respectively.
  
  After slit positioning we request an offset of alpha=-45.105 (to the west) arcsec
   and delta=+28.930 (to the North) to center the slit on the target. The reference
   star will still be in the slit after offsetting. 
  
  The science observation sequence is divided in 1 exposure (NEXP=1) and 2 offsets
   (NOFF=2) along the slit at -9 arcsec and 6 arcsec. Each exposure lasts 1530 sec.
   The retarder plate will be at the same angle during the OB, either 0 or 45 degrees.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• Seeing < 1" 
  Clear sky
  Dark moon

Time-Critical Aspects

• There are no time-critical aspects.
  The best observality windows are in August and September 2008 during the second
   half of the night.

Special Execution Requirements

• ---(Empty)---

Special Calibration Information

• No special request. Standard calibration will be used.

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• No pre-imaging required.

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