14871( 2) - 16-Nov-2016 15:05:25 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14871 Version: 2 Check-in Time: 16-Nov-2016 15:05:25 STScI Edit Number: 0 Title WFC3: Improving the CALSPEC model for GRW+70D5824 ------------------------------------------------------------------------------------ Type Cycle CAL/WFC3 24 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Susana E. Deustua Space Telescope Science Institute Y CoI: Dr. Ralph C. Bohlin Space Telescope Science Institute Y CoI: Ms. Jennifer Mack Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract Improve the flux standard GRW+70D5824 by obtaining precise (high signal to noise) STIS spectroscopy between 0.3 and 1.0 microns. Our goal of providing a 1% flux cal means that all various sub-pieces must be defined to sub-percent precision. In addition to providing a new excellent flux standard for the community, there are dozens of existing ACS and WFC3 observations of GRW+70D5824 that will become useful for cross-instrument flux calibration in the crucial 3000-5500A range. Because GRW+70D5824 is the STIS UV monitor standard with 86 G140L (1150-1730A) and 89 G230L (1570-3180A) spectra, GRW+70D5824 will become one of the five best of all the CALSPEC standards with complete STIS and NICMOS coverage to 2.5microns. ------------------------------------------------------------------------------------ Observations Description ------------------------ GRW+70D5824 is a V=12.77 mag DA3 white dwarf, used by WFC3 and ACS and STIS in the UV to monitor contamination, PSF, and focus changes. To date, there are 2500+ WFC3 (1300+ in the UV alone) and 320+ ACS datasets obtained for this purpose (WFPC2 has 7000+ observations). However, this very important, oft observed star is not a good CALSPEC flux standard in the visible. Its lone low S/N G430L STIS spectrum establishes its absolute flux between 3000 and 5500A and covers some of the most important filters for ACS and WFC3. Further, there are only two epochs of G750L (5240-10270A) spectra. Four external orbits with STIS are required. A minimum of three high quality G430L spectra (3 orbits) obtained in different visits (1 after separate anneals) are beat down statistical noise. For G750L, 1 orbit is requested to combine with the two existing epochs. The 1sigma G430L repeatability even in 200A wide bins ranges up to 0.5%, so to reduce the 3sigma statistical precision to <1%, 3 well exposed observations are required. The one existing G430L has low signal to noise, and a two orbit program would achieve a 1sigma precision of ~0.4% and a 3sigma precision of only 1.1%. ------------------------------------------------------------------------------------ 14871( 2) - 16-Nov-2016 15:05:25 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GRW+70D5824 STAR, DA RA=13H38M50.4757S, J2000 V = 12.773 DEC=+70D17'7.66" Reference Frame: ICRS Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 -0.07977253483034491 -0.022 .03829 ------------------------------------------------------------------------------------------------------------------------------------ 14871( 2) - 16-Nov-2016 15:05:25 - [ 3] Visit: 01 (STIS.ta.844477) Visit Requirements: BEFORE 16-JUL-2017:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRW+70D5824 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) SEQ 1-7 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 WAVE STIS/CCD ACCUM 52X0.1 G430L 4300 1 DEF (0 S) NEW ALIGNMENT ------------------------------------------------------------------------------------------------------------------------------------ 3 GRW+70D5824 STIS/CCD ACCUM 52X2E1 G430L 4300 CR-SPLIT=2, GAIN=4, WAVECAL=NO 1 796.0 S (796 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 GRW+70D5824 STIS/CCD ACCUM 52X2 G430L 4300 CR-SPLIT=2, GAIN=4, WAVECAL=NO 1 796.0 S (796 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 GRW+70D5824 STIS/CCD ACCUM 52X2 G750L 7751 CR-SPLIT=2, GAIN=4, WAVECAL=NO 1 794 S (794 MAX DUR 100.0 %; MIN DUR S) 99.0 % ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/CCD ACCUM 52X0.1 G750L 7751 1 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NONE STIS/CCD ACCUM 0.3X0.09 G750L 7751 GAIN=4, LAMP=TUNGSTEN 4 120.0 S (480 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ GRW+70D5824 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A WAVE 2 STIS/CCD ACCUM 52X0.1 G430L 4300 none none none none 1 N/A GRW+70D5824 3 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 1 1 N/A GRW+70D5824 3 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 2 1 N/A GRW+70D5824 4 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 N/A GRW+70D5824 4 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 N/A GRW+70D5824 5 STIS/CCD ACCUM 52X2 G750L 7751 none none none 1 1 N/A GRW+70D5824 5 STIS/CCD ACCUM 52X2 G750L 7751 none none none 2 1 N/A WAVE 6 STIS/CCD ACCUM 52X0.1 G750L 7751 none none none none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 1 none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 2 none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 3 none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 4 none 1 N/A 14871( 2) - 16-Nov-2016 15:05:25 - [ 4] Visit: 02 (STIS.ta.844477) Visit Requirements: AFTER 01 BY 21 D TO 300 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRW+70D5824 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) SEQ 1-7 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 WAVE STIS/CCD ACCUM 52X0.1 G430L 4300 1 DEF (0 S) NEW ALIGNMENT ------------------------------------------------------------------------------------------------------------------------------------ 3 GRW+70D5824 STIS/CCD ACCUM 52X2E1 G430L 4300 CR-SPLIT=2, GAIN=4, WAVECAL=NO 1 796.0 S (796 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 GRW+70D5824 STIS/CCD ACCUM 52X2 G430L 4300 CR-SPLIT=2, GAIN=4, WAVECAL=NO 1 796.0 S (796 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 GRW+70D5824 STIS/CCD ACCUM 52X2 G750L 7751 CR-SPLIT=2, GAIN=4, WAVECAL=NO 1 794 S (794 MAX DUR 100.0 %; MIN DUR S) 99.0 % ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/CCD ACCUM 52X0.1 G750L 7751 1 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NONE STIS/CCD ACCUM 0.3X0.09 G750L 7751 GAIN=4, LAMP=TUNGSTEN 4 120.0 S (480 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ GRW+70D5824 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A WAVE 2 STIS/CCD ACCUM 52X0.1 G430L 4300 none none none none 1 N/A GRW+70D5824 3 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 1 1 N/A GRW+70D5824 3 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 2 1 N/A GRW+70D5824 4 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 N/A GRW+70D5824 4 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 N/A GRW+70D5824 5 STIS/CCD ACCUM 52X2 G750L 7751 none none none 1 1 N/A GRW+70D5824 5 STIS/CCD ACCUM 52X2 G750L 7751 none none none 2 1 N/A WAVE 6 STIS/CCD ACCUM 52X0.1 G750L 7751 none none none none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 1 none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 2 none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 3 none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 4 none 1 N/A 14871( 2) - 16-Nov-2016 15:05:25 - [ 5] Visit: 03 (STIS.ta.844477) Visit Requirements: AFTER 02 BY 21 D TO 300 D On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRW+70D5824 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) SEQ 1-7 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 WAVE STIS/CCD ACCUM 52X0.1 G430L 4300 1 DEF (0 S) NEW ALIGNMENT ------------------------------------------------------------------------------------------------------------------------------------ 3 GRW+70D5824 STIS/CCD ACCUM 52X2E1 G430L 4300 CR-SPLIT=2, GAIN=4, WAVECAL=NO 1 796.0 S (796 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 GRW+70D5824 STIS/CCD ACCUM 52X2 G430L 4300 CR-SPLIT=2, GAIN=4, WAVECAL=NO 1 796.0 S (796 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 GRW+70D5824 STIS/CCD ACCUM 52X2 G750L 7751 CR-SPLIT=2, GAIN=4, WAVECAL=NO 1 794 S (794 MAX DUR 100.0 %; MIN DUR S) 99.0 % ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/CCD ACCUM 52X0.1 G750L 7751 1 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NONE STIS/CCD ACCUM 0.3X0.09 G750L 7751 GAIN=4, LAMP=TUNGSTEN 4 120.0 S (480 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ GRW+70D5824 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A WAVE 2 STIS/CCD ACCUM 52X0.1 G430L 4300 none none none none 1 N/A GRW+70D5824 3 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 1 1 N/A GRW+70D5824 3 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 2 1 N/A GRW+70D5824 4 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 N/A GRW+70D5824 4 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 N/A GRW+70D5824 5 STIS/CCD ACCUM 52X2 G750L 7751 none none none 1 1 N/A GRW+70D5824 5 STIS/CCD ACCUM 52X2 G750L 7751 none none none 2 1 N/A WAVE 6 STIS/CCD ACCUM 52X0.1 G750L 7751 none none none none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 1 none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 2 none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 3 none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 4 none 1 N/A 14871( 2) - 16-Nov-2016 15:05:25 - [ 6] Visit: 04 (STIS.ta.844477) Visit Requirements: AFTER 03 BY 21 D TO 300 D; BEFORE 30-SEP-2017:00:00:00 On Hold Comments: Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRW+70D5824 STIS/CCD ACQ F28X50LP MIRROR 1 1 S (1 S) SEQ 1-7 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ 2 WAVE STIS/CCD ACCUM 52X0.1 G430L 4300 1 DEF (0 S) NEW ALIGNMENT ------------------------------------------------------------------------------------------------------------------------------------ 3 GRW+70D5824 STIS/CCD ACCUM 52X2E1 G430L 4300 CR-SPLIT=2, GAIN=4, WAVECAL=NO 1 796.0 S (796 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 GRW+70D5824 STIS/CCD ACCUM 52X2 G430L 4300 CR-SPLIT=2, GAIN=4, WAVECAL=NO 1 796.0 S (796 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 GRW+70D5824 STIS/CCD ACCUM 52X2 G750L 7751 CR-SPLIT=2, GAIN=4, WAVECAL=NO 1 794 S (794 MAX DUR 100.0 %; MIN DUR S) 99.0 % ------------------------------------------------------------------------------------------------------------------------------------ 6 WAVE STIS/CCD ACCUM 52X0.1 G750L 7751 1 DEF (0 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 NONE STIS/CCD ACCUM 0.3X0.09 G750L 7751 GAIN=4, LAMP=TUNGSTEN 4 120.0 S (480 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ GRW+70D5824 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A WAVE 2 STIS/CCD ACCUM 52X0.1 G430L 4300 none none none none 1 N/A GRW+70D5824 3 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 1 1 N/A GRW+70D5824 3 STIS/CCD ACCUM 52X2E1 G430L 4300 none none none 2 1 N/A GRW+70D5824 4 STIS/CCD ACCUM 52X2 G430L 4300 none none none 1 1 N/A GRW+70D5824 4 STIS/CCD ACCUM 52X2 G430L 4300 none none none 2 1 N/A GRW+70D5824 5 STIS/CCD ACCUM 52X2 G750L 7751 none none none 1 1 N/A GRW+70D5824 5 STIS/CCD ACCUM 52X2 G750L 7751 none none none 2 1 N/A WAVE 6 STIS/CCD ACCUM 52X0.1 G750L 7751 none none none none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 1 none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 2 none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 3 none 1 N/A NONE 7 STIS/CCD ACCUM 0.3X0.09 G750L 7751 none none 4 none 1 N/A 14871( 2) - 16-Nov-2016 15:05:25 - [ 7] Summary Form for Proposal 14871 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 0.3X0.09, 52X0.1, 52X2, 52X2E1, F28X50LP ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=2, GAIN=4, LAMP=TUNGSTEN, WAVECAL=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 21 D TO 300 D, AFTER 02 BY 21 D TO 300 D, AFTER 03 BY 21 D TO 300 D, BEFORE 16-JUL-2017:00:00:00, BEFORE 30-SEP-2017:00:00:00, MAX DUR 100.0 %, MIN DUR 99.0 %, NEW ALIGNMENT, SEQ 1-7 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G430L, G750L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names GRW+70D5824, NONE, WAVE ------------------------------------------------------------------------------------------------------------------------------------