README web version of /home/usg/OPS/MTS/readme_xml/readme_84070701

Principal Investigator Email Address

• silverma@phys.ethz.ch

Estimated Total Execution Time (hours, including overheads)

• 14.84

General Description

• We are acquiring optical spectra of very faint targets with magnitudes
   between 23-25.  To do so, we have a total on-source integration time of 9.9 hours.
  
  Each OB is designed to first have an acquisition image taken with an exposure time
   of 235 seconds using the R-band filter.  This longer acquisition image enables some
   of the targets to be visible in the slits.  Each mask has a few brighter targets
   R=21-22 that should be visible.  If not, please use the bright acquisition stars
   for centering.  Two consecutive science frames each of 33 minutes at the same offset
   position will be taken for a total of 1.1 hours on source.  At the end, we request
   a nighttime arc (calibration) lamp exposure.  No nightime flat is required. We will
   use the daytime flat for calibration.  The total execution time is 1.65 hours per
   OB.  We have been granted a waiver by ESO to design our OBs longer than 1 hour.
  
  We do not need any additional observations of standard stars.  We will use the regular
   calibrations already observed that are not costly to our program.
  
  The above description of a single OB is repeated 9 times each at a varying offset
   position with the offset 0, -1.5, +1.5 arcsecs along the slit that effectively keeps
   all objects within the slit for all exposures since we have designed the masks to
   have 3 arcsecs of sky on each side of the object for the pointing with an offset
   of 0.0"
  
  Thank you for the help with these observations.

Waiver Requests

• Waiver request was accepted to design OBs longer than 1 hour.

Critical Observing Condition Constraints

• The observations must be carried out in dark time as specified in each
   OB with an airmass less than 1.2, seeing less than 1", moon illumination less than
   0.3 and a distance to the moon greater than 60 degrees.

Time-Critical Aspects

• None

Special Execution Requirements

• Again, these targets are faint with magnitudes between 23 and 26th.  Therefore
   an acquisition image close to 4 minutes in integration time will enable one to view
   some of the brighter targets in the slits.  If needed, please use the acquisition
   (i.e. reference) stars for alignment

Special Calibration Information

• An arc lamp exposure is requested at the end of each ob.

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• ---(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 ?

• YES

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

Did you specify suitable guide stars for all your OBs using Guidecam
 ?

• YES

Did you check that the chosen guide stars are suitable for all the offset
 positions and that they do not produce unacceptable vignetting of the field of view
 ?

• YES