README web version of /home/usg/OPS/MTS/readme_xml/readme_79038000

Principal Investigator Email Address

• sbrillan@eso.org

Estimated Total Execution Time (hours, including overheads)

• 13:58

General Description

• Target of Opportunity program to take high resolution spectra of Bulge
   stars during a microlensing event. The goal is to obtain spectra before, during
   and after the crossing of a Caustic. This will allow to take advantadge of the differential
   magnification due to the caustic to study in details the variation of the atmosphere
   from center to limb.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• As this program is a Target of Opportunity program, we need to observe
   respecting the proper timing.
  Only for the post caustic observation we need conditions that are good enough since
   the object is fainter.
  Pre-Caustic and Caustic Crossing observation are to be done at the right time indepedently
   of the conditions

Time-Critical Aspects

• Pre-Caustic observation have to be taken in the few days after
  the first activation of the ToO.
  
  Once the program have been activated for a Caustic crossing, 
  we have to do continuous observations until the end of the transit
  of the source star over the caustic or until confirmation of the 
  order to stop by one member of the collaboration. It might be possible
  that we will ask for non continous observations in case the phenomenon
  is lasting more than one night. Therefore, a serie of OB will be asked
  for night 1, another serie for night 2. We would do so only to maximize 
  the scientific output. Of course we will inform VISAS about our planned
  strategy to sample the caustic exit.
  
  Post-Caustic observations have to be done after the 
  transit over the caustic is ended, optimally a few days 
  after the end of the caustic observation. In this case, the star would
  still be magnified, a good S/N could be achieved.

Special Execution Requirements

• ---(Empty)---

Special Calibration Information

• ---(Empty)---

ToO Information

• This program is a Target of Opportunity program designed to observe with
   UVES 
  the transit of the source star over a microlensing caustic. 
  We want to sample the phenomenon in time, with a particular interest 
  for the exit phase of the caustic crossing.
  This timing will allow to observe different part of the atmosphere of the 
  lensed star (center, trailing limb, limb) as they are amplified 
  differentially by the lensing object.
  The general strategy for the observation is the following
  
  - Pre-Caustic: Template to be executed before the caustic crossing that
  we will observe with a good time resolution (x OBs)
  
  - Caustic Crossing: Series of OB's that have to be executed continuously 
  (or by blocks, like 4 hours of observations on night 1, then 6 hours on
  night 2, the exact strategy on the timing will be given to the astronomers
  on duty at Paranal, depending on the behavior of the caustic crossing)
  during the crossing of the caustic, with the main goal of the program being to 
  cover the exit phase. The timing of this phase is absolutely critical. 
  Strong interaction with astronomers on duty will be needed in order 
  to successfully do the observations. 
  
  - Post-Caustic: OB's that can be taken at any moment after the end of 
  the cautic crossing.

ToO Activators List

• Stephane Brillant 
  Jean Philippe Beaulieu
  Pascal Fouque
  Christian Coutures
  John Menzies
  Daniel Kubas

Is this a Pre-imaging run ?

• false

Pre-imaging Requirements

• ---(Empty)---

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 ?

• N/A

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

• N/A