README web version of /home/usg/OPS/MTS/readme_xml/readme_79011600

Principal Investigator Email Address

• uemuram@hiroshima-u.ac.jp

Estimated Total Execution Time (hours, including overheads)

• 18 hours

General Description

• These OBs are for ToO observations of a black hole X-ray binary, V4641
   Sgr with the HITI mode of FORS2/VLT.  The main goal of this run is to obtain the
   time evolution of power spectra of the optical emission from the target in outbusrt,
   which possibly comes from a vicinity of a stellar mass black hole.  Our team is
   also planning to perform ToO observations with the RXTE satellite, which enables
   us to perform simultaneous observations of X-ray and optical variations.  In this
   project, we focus on a time-scale of 0.001-10 sec. 
      Our target, V4641 Sgr, has entered in outburst once a year in the last few years
   (2002 May, 2003 Aug, 2004 Jul and 2005 Jun).  We can expect the next outburst during
   this semester.
      The prepared OBs are quite simple; there are 18 OBs, but all of them have same
   configuration.  For more information about the OBs, see "ToO information" of this
   README file.
      We rotate the field in order to put the target and another standard star simultaneously
   on the slit.  This is also indicated in the attached finding chart.  See "Special
   Execution Requirements".

Waiver Requests

• No Waiver Request was submitted

Critical Observing Condition Constraints

• Nothing special. When the ToO is triggered, the run should be started
   as soon as possible even under thin clouds or bad seeings.

Time-Critical Aspects

• nothing special

Special Execution Requirements

• Please note that we rotate the field in order to put the target and a
   comparison star simultaneously on the MOS slit.  The position of the target, V4641
   Sgr, is RA=18:19:21.58, Dec=-25:24:25.1.  The neighbor comparison star, GSC2.2_S301231150215,
   is at RA=18:10:22.701, Dec=-25:24:17.84.  The rotation angle is calculated to be
   -66.65 deg. (PA=66.65).  The angular separation of them is about 18", so a long
   MOS slit (22") is preferable than a short one (20") for our observations.  We attached
   a finding chart, which may helpful for observations.

Special Calibration Information

• ---(Empty)---

ToO Information

• These are ToO OBs.  The ToO run will be triggered when the target is in
   outburst. 
      Our target, V4641 Sgr, is V=13.8 at quiescence and V=12-10 during outbursts
   (highly variable).
      The most important point is a quick start of the run when we trigger the ToO.
    In other words, the ToO observation should be performed even under thin clouds
   or bad seeings when it is tiggered.
      All prepared OBs are same; about 1 hour run with the HIT_OS3 mode.  In total,
   we have 18 hours for our ToO, hence, the number of the OBs is 18.  It depends on
   the situation how many OBs should be performed in one night, while we put the minimum
   and maximum time, that is, 2 and 6 hours (2 and 6 OBs) in one night, respectively.
    So, the range of run times is variable between 2 - 6 hours in one night, and the
   number of nights for our ToO is also variable between 3 - 9 nights (18/6 - 18/2).
    We will notify the number of OBs to be performed in one night, at the same time
   that we trigger the ToO run.

ToO Activators List

• Makoto Uemura (PI; Hiroshima Univ.) uemuram@hiroshima-u.ac.jp
  Taichi Kato (Kyoto Univ.) tkato@kusastro.kyoto-u.ac.jp
  Daisaku Nogami (Kyoto Univ.) nogami@kwasan.kyoto-u.ac.jp
  Akira Imada (Kyoto Univ.) a_imada@kusastro.kyoto-u.ac.jp
  Ryoko Ishioka (National Astronomical Observatory Japan) ishioka@subaru.naoj.org
  Kazutaka Yamaoka (Aoyama Gakuin Univ.) yamaoka@phys.aoyama.ac.jp

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