README web version of /home/usg/OPS/MTS/readme_xml/readme_76080000

Principal Investigator Email Address

• bunker@astro.ex.ac.uk

Estimated Total Execution Time (hours, including overheads)

• 26.0

General Description

• We are observing candidate z=6 high redshift star forming
  galaxies, selected as being i-band drop outs in the
  Hubble Ultra Deep Field and the surrounding HST/ACS GOODS
  imaging of Chandra Deep Field South.
  
  This is a continuation of the project 074.A-0496
  and we are using the same two FORS2-MXU masks
  (BunkerUDFm1 and BunkerUDFm2).
  
  Following a report from Dr. Mario van den Ancker
  on 08 February 2005 (ESO - User Support Department.) 
  that the first mask (BunkerUDFm1) had some problems with 
  guiding due to lack of bright stars in the field, we tightened 
  the seeing requirement from 1.0arcsec to 0.8arcsec to minimize slit
  losses (as recommended).

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• The seeing should be <1arcsec as this is our slit width,
  and for mask 1 the seeing should be <0.8arcsec (as the
  lack of bright guide stars produces a poorer PSF).

Time-Critical Aspects

• None

Special Execution Requirements

• For the acquisition images, we now have the I-band filter
  in, as this is the wavelength of interest for the spectroscopy,
  and we want to centre the mask using the same atmospheric
  dispersion as the wavelengths of interest in the spectroscopy.
  For the actual spectroscopy, we then switch to the order-blocking
  OG590 filter for slightly larger wavelength coverage and
  higher through-put than the I-band filter.
  
  Please advise whether this change of filter is the correct
  procedure to ensure we are well centered on the object
  centres at ~8000Ang.

Special Calibration Information

• We would like flat-fields and arc lamps through our two
  masks - which apparently is standard calibration and we
  do not need to specify an OB.

ToO Information

• None

ToO Activators List

• None

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• Source of preimaging: The Hubble Ultra Deep Field
  and the GOODSv1.0 images, which have excellent
  astrometry.

Source(s) of Pre-imaging

• HST/ACS

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 prepared your finding charts with tools other than FIMS,
 do they comply with the specifications on the FORS2 Phase 2 web page ?

• N/A