README web version of /home/usg/OPS/MTS/readme_xml/readme_60942800

Principal Investigator Email Address

• pg@crab.riken.jp

Estimated Total Execution Time (hours, including overheads)

• 1

General Description

• Simple broad-band spectroscopy of well-known Galactic black hole candidate
   GX 339-4. The aim is to detect a spectral break (slope change) expected in the near-IR
   due to the transition from a jet to an accretion disc-dominated spectrum. 
  
  
  Finding chart 1 : 60.A-9428_001.JPG : Large field-of-view image
  Finding chart 2 : 60.A-9428_002.JPG : Zoom in, also indicating large source variability
   and suggested slit angle.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• None

Time-Critical Aspects

• None

Special Execution Requirements

• Simple observation of bright(ish) point source. 
  
  * Just watch out for a nearby star almost exactly 5 arcsec south of target. 
  
  * And note that the source is highly variable, with typical V~16-18, but minimum
   and maximum ranges are over V~15-20; I attach two several finding charts showing
   different source states to make acquisition easier.
  
  * I have adjusted exposure Texp, DIT and NINT so that the source does not saturate
   even if it happens to be rather bright (V~16). But please feel free to choose a
   different setup for better optimization.
  
  * Slit position angle chosen to avoid star 5" south, but angle not critical. Same
   for throw value.

Special Calibration Information

• None. We simply want accurate cross-calibration between the arms in order
   to model the entire continuum. This can be achieved with standard CCD, ARC, TELLURIC
   and SPECPHOT calibrations.  Any hot telluric star will do.

ToO Information

• Not applicable

ToO Activators List

• None

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?

• YES

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