README web version of /home/usg/OPS/MTS/readme_xml/readme_60941600

Principal Investigator Email Address

• oliveira@strw.leidenuniv.nl

Estimated Total Execution Time (hours, including overheads)

• 1h

General Description

• -------------------------------------------------------------------
  
  Principal Investigator Email Address : oliveira@strw.leidenuniv.nl
  ====================================
  
  Estimated Total Execution Time (hours, including overheads) : 1.0 (hours)
  ===========================================================
  
  General Description
  ===================
  
  Science case
  ------------
  An intriguing newly discovered object, selected based on IR-excess on
  Spitzer photometry, has been observed in the Serpens Molecular
  Cloud with the InfraRed Spectrograph (IRS) on board the Spitzer Space
  Telescope. The IRS spectrum presents strong high ionization lines
  consistent with a supernova remnant (SNR). Although these data give
  important clues, it is not possible to confirm the nature of this
  source by the IRS spectrum alone. Complimentary high resolution
  spectroscopy is necessary to disentangle this puzzle and rule out
  other interpretations such as a dusty planetary nebula. Bright
  spatially resolved emission lines in a wide range of wavelengths should
  provide the necessary information and confirm this object as a
  SNR. With X-shooter on the VLT, enough S/N for line detection can be
  achieved in 45 minutes. If confirmed, this object will be the 2nd SNR
  discovered by its infrared properties.
  
  Technical details
  -----------------
  
  Granted time: 1h
  Slit: 1"
  Orientation: 45 degrees from North to East
  
  Nodding on slit:
  - 2 cycles (ABBA sequence)
  - 1 UVB, 2 VIS and 3 NIR exposures per position
  
    - integration times 690s in UVB in 1x2 slow, 320s in VIS in 1x2
      slow, and 240s in NIR the total execution time splits as follows:
  
      	  - Pointing / acquisition / SLIT setup: 360s + 180s + 30s = 570s
  	  - At each position the total integration and readout time per arm is:
              o UVB: 1x(690+38) = 728s
              o VIS: 2x(320+48) = 736s
              o NIR: 3x(240+0.88) = 723s
  
    - Total integration and readout time: 4x736s = 2944s
    - Total telescope offsets: 4x15 = 60s
  
    - Total execution time: 59m34s
  
  
  Critical Observing Condition Constraints
  ========================================
  SKY TRANSPARENCY: 2CLR
  
  SEEING: 1.2 (arcsec)
  
  LUNAR ILLUMINATION: 0.7 (0.0-1.0)
  
  MOON ANGULAR DISTANCE: 50 (degrees)
  
  
  Time-Critical Aspects
  =====================
  N/A
  
  
  Special Execution Requirements
  ==============================
  
  The Object's R magnitude is 22. If it's hard to spot the object in the
  acquisition image and the night astronomer prefers to use an offset
  from a reference star, then I'm providing a reference star:
  
  Target (marked in red in FC): 18:28:27.12 +00:44:44.25 (J2000.0)
  Reference star (marked in green in FC): 18:28:26.22 +00:44:51.2 (J2000.0)
  Offset from reference to target: 13.50" East, 7.02" South
  
  Two finding charts are given, with different sizes (as requested in
  July when I first sent this information for the run that was canceled).
  
  The object has better airmass during the August run than the September run.
  
  Special Calibration Information
  ===============================
  No extra calibrations needed.
  
  
  ToO Information
  ===============
  N/A
  
  
  ToO Activators List
  ===================
  N/A

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• N/A

Time-Critical Aspects

• N/A

Special Execution Requirements

• N/A

Special Calibration Information

• N/A

ToO Information

• N/A

ToO Activators List

• N/A

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