README web version of /home/usg/OPS/MTS/readme_xml/readme_82045301

Principal Investigator Email Address

• sofia@astro.lu.se

Estimated Total Execution Time (hours, including overheads)

• 02:23:50.000

General Description

• The observations concerns spectroscopic observations of dwarf stars
  situated in the galactic bulge but that are, at the time of
  observation, lensed by a foreground object. In this way the star
  is greatly magnified. Normally the star is around 19-20 in V but might
  be even fainter thanks to extinction. However, at the time of the
  lensing event the star gets many magnitudes brighter, reaching
  magnitudes brighter than about V=15.
  
  Our programme is designated to obtain high-resolution spectra of 
  such stars at the time of the lensing event. 
  
  The observations are standard observations with UVES. However, the 
  finding charts (FC) will be unusual as they are prepared _prior_ to 
  the lensing event producing the full magnification. This means that
  in the FC the star that will actually be observed is not visible.
  But at the time of observation the star will be there and should
  be readily identifiable on the sky (with the help of the FC). 
  
  The triggers for these observations come from the MOA and OGLE
  collaborations. Both these mainly monitor in the I band and hence our
  triggers will in practice be based on the I-band magnitudes from 
  those projects. The FC will therefore also be in the I-band.
  
  For each trigger we have two OBs - one for the science target and one
  for a B star (for removal/identification of telluric lines). 
  
  The science OB for the lensed bulge dwarf stasr includes four
  consecutive exposures of 1800s - making up a total of 2hours of
  exposure on target. We have obtained a waiver in order to use this set-up
  and hence exceed the nominal time for an OB.
  
  Each trigger also includes an observation of one fast rotating B star.
  Also for this object we will submit the coordinates and perhaps modify
  the exposure time at the time of the trigger in order to be able to
  pick an optimumly placed star. This B star should be observed close in
  time to the observation of the lensed bulge dwarf star but need not be
  observed straight after. Finding chart for the B star will be submitted
  at the time of the trigger.
  
  +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
  Email response from USD re time of trigger:
  >Email from USD:
  >Task                      : Phase II
  >inst/sub task             : UVES
  >Resolution                : 
  >   07/10/08 09:00:26     fpatat
  >      Dear Sofia,
  >
  >      a delay of one hour is still acceptable. What is important is
  >      that the trigger does not come much later than that.  
  >      ....
  >
  >      However, I think that if you are able to submit the trigger
  >      before 19:00 Paranal time, this will be ok. I suggest you point
  >      out this fact in the README file, so that your contact scientist
  >      will be aware of it and will let Paranal know well in advance.
  >
  >      Regards,
  >
  >      Nando

Waiver Requests

• WAIVERS 082.B-0453A.01.WAV and 82.B-0453B.01.WAV approved on the 10.07.2008
  
  Additionally we asked if it is permitted to trigger until 7pm local time on Paranal
   and still be able to get the observations carried out that night. It is beneficial
   for our progam to do so as we can catch more fast rising events in this way for
   which we will only know that they are rising by 5-6 pm. These objects are triggered
   from the observations carried out on New Zeeland within the MOA project. 
  We recieved an affitmative answer to our quesion and will assume that we can trigger
   until 7pm (see email in general readme text). Please let us know if this is a problem.

Critical Observing Condition Constraints

• N7A

Time-Critical Aspects

• N/A

Special Execution Requirements

• The fields are crowded as we are observing towards the Galactic Bulge.
   It is therefore important to have the correct angle for the slit. The trigger will
   include information on this. The derotator should be set to SKY and ADC to AUTO.
   The trigger will provide the PA.
  
  The OBs are unusually long. We have obtained a waiver for this.

Special Calibration Information

• N/A

ToO Information

• Each activation includes the observation of one lensed Bulge dwarf star
   and one B star (for the removal of telluric lines). The B star should be observed
   close in time to the main science observation. But they need to be straight after
   each other. 
  
  The activator will provide coordinates for the Bulge dwarf star and for the B star.
   S/he will also provide finding charts for both targets. These finding charts will
   be based on the MOA and OGLE images (both these projects regularly monitor the Bulge
   for lensing events and we take our triggers from the analysis of their data). Web-sites
   for the projects http://sirius.astrouw.edu.pl/~ogle/ or http://bulge.astro.princeton.edu/~ogle/
   and http://www.phys.canterbury.ac.nz/moa/
  
  One of the possible triggers comes from the MOA project that operates in New Zeeland.
   Due to the time differences and how that project operates we can get to know about
   very interesting, quickly rising, targets as late as 5-6pm local Paranal time. We
   understand that the normal requirement for ToO observations to be carried out the
   same night as the trigger goes in is that the trigger reaches Paranal beofer 6pm
   local time. However, on the direct question to the USD we got the reply that the
   ToO would still be executed if we triggered no tlater than 7 pm (we also asked if
   we needed a waiver for this but was told not). We thsu will assume that we can trigger
   until 7pm Please let us know if there are issues with this. For completeness, the
   response from USD at the end of the general description.

ToO Activators List

• Sofia Feltzing sofia@astro.lu.se
  Thomas Bensby tbensby@eso.org
  Jennifer Simmerer jennifer@astro.lu.se
  Jennifer Johnson jaj@astronomy.ohio-state.edu
  Daniel Aden daniela@astro.lu.se

Do all your OBs comply with the instrument-specific requirements listed
 on the instrument-specific Phase 2 web page ?

• YES

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 specified the S/N ratio at given wavelength in the User Comments
 field of each OB?

• 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 need secondary guiding, are there suitable objects within 30 arcsec
 from your target ?

• N/A