README web version of /home/usg/OPS/MTS/readme_xml/readme_82501002

Principal Investigator Email Address

• wangzx@physics.mcgill.ca

Estimated Total Execution Time (hours, including overheads)

• 1.5 hours

General Description

• The target SAX J1808.4-3658 has been in an outburst since Sept. 21.
  I have the three observations to monitor the modulation in the source's optical
  light curve, seeking to determine the orgin of a modulation transition seen
  in the light curves that were obtained in early October.
  
  The target is estimated to have R = 19; however it could be fainter than estimated.
  Therefore a 15 sec exposure time is set. In each of 1.5 hour observations, 100 15-sec
  exposures would be made.
  
  Because each OB can not be longer than 1 hour, two 44 min OBs are set.
  
  ------------------------------------------------------------------------
  On Nov. 7, I have changed exposure time for each image to 60 sec. Therefore 
  in 1.5 hour, 25 60-sec images will be made.

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• The source is only visible in the early night.
  Since the source is relatively bright, R~19 mag,
  nearly no constraints are required.
  
  Since we will use differential photometry, non-photometric
  and thin cirrus conditions are OK.

Time-Critical Aspects

• From previous observations, the target's outburst would last about 40
   days.
  As the current outburst started from Sept. 21, one month has passed since
  the onset of the outburst. Therefore the observations should be conducted
  as soon as possible, as it would be close to the end of the outburst.

Special Execution Requirements

• A phase-coherent timing technique is used to determine the optical
  modulation period accurately. The three observations should be made
  on days 1, 2, 5+/-1, or alternatively, on days 1, (5+/-1), (5+/-1)+1.

Special Calibration Information

• ---(Empty)---

ToO Information

• ---(Empty)---

ToO Activators List

• ---(Empty)---

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 ?

• 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 ?

• 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 have prepared your finding charts with tools other than FIMS,
 do they comply with the specifications on the FORS1 Phase 2 web page ?

• N/A