README web version of /home/usg/OPS/MTS/readme_xml/readme_80041103

Principal Investigator Email Address

• silverma@phys.ethz.ch

Estimated Total Execution Time (hours, including overheads)

• 21.99

General Description

• We are acquiring optical spectra of very faint targets with magnitudes
   between 23-26. To do so, we have a total on-source integration time of 14 hours.
  
  Each OBI 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 through slit image.  Each mask has a few brighter
   targets with R~21-22 that should be visible. If not, please use the bright acquisition
   stars for centering.  Two consecutive science frames each of 30 minutes at the same
   offset position will be taken for a total of 1 hour integration on-source.  At the
   end, we request a nighttime arc (calibration) lamp exposure.  No nighttime flat
   is required.  We will use the daytime flat for calibration.  The total execution
   time for each OBI is 1.57 hours.  We have been granted a waiver by ESO to design
   our OBIs to be longer than 1 hour.
  
  We do not need any additional observations of standard stars.  We will use the regular
   calibrations already observed that do not cost our program any time.
  
  The above description of a single OBI is repeated 14 times each at a varying offset
   position with offsets of 0.0,+1.0,-1.0,+2.0,-2.0 arcsecs along the slit that effectively
   keeps all objects within the slits for all exposures since we have designed the
   masks to have 3 arcsec of sky on each side of the targets for the pointing with
   an offset of 0.0 arcsecs.
  
  Thank you for the help in planning and carrying out these observations.
  
  Sincerely,
  
  John Silverman

Waiver Requests

• A waiver has been accepted by ESO to define our OBIs to be longer than
   1 hour.

Critical Observing Condition Constraints

• Observations must be carried out in dark time and under good weather conditions.
  Clear, Seeing=1.0, Airmass<~1.2, Moon illumination <~ 0.3 and distance to
   the moon>~60 degrees

Time-Critical Aspects

• None

Special Execution Requirements

• None

Special Calibration Information

• A single nighttime arc lamp exposure should be taken for accurate wavelength
   calibration for each OBI.

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 ?

• 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

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