changed to CAL/ACS -1200827689 ----- Attempting Submission 1 (Mon Oct 23 18:24:38 GMT 2017) ----- ----- Attempting Submission 2 (Mon Oct 23 18:39:33 GMT 2017) ----- The goal of this proposal is to observe an emission line star (WR96) with the ACS/WFC G800L grism to provide a check on trace and wavelength calibrations as a function of spatial position on the ACS detector. The goal of this proposal is to observe an emission line star (WR96) with the ACS/WFC G800L grism to provide a check on trace and wavelength calibrations as a function of spatial position on the ACS detector. WR96 is a Wolf-Rayet star, which is a bright (V~14 mag) point source with strong emission lines. These features make this star an ideal candidate for wavelength calibration of ACS grism. We will observe WR96 for 20 secs (G800L) and 1 sec (F775W) at 3 different positions on the ACS detector (2 chip centers and 1 additional position on chip1). In addition to F775W direct imaging, we will also use F625W (1sec) at one position to check the image position stability against the selected filters. The WFC1 aperture at the center of chip1 will allow us to compare these new observations with the existing observations of the same star at the same position. The full detector readout for two apertures (WFC1 and WFC2) at chip centers will allow us to observe other stars/compact objects in the ACS field of view, which will be important to perform a check on trace calibration. Galaxies and the IGM 0 true RESTRICTED CALIBRATION WAVELENGTH This object was generated by the targetselector and retrieved from the SIMBAD database. WR96 J2000 ACS/WFC Spectroscopic No No G800L 1507839786707 The scheduling data was generated by CASM 25.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 15401 :visit-id "01" :proposal-version -1 :trans-version "20170613" :date "12-Oct-2017 16:23:06.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1350128 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 15401 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 15401 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2683 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3240 :pcs-gap 0 ) false 1 0