The list of Investigators does not match the STScI records for this program.First submission of Cycle 31 monitor for WFC3/IR grism flux/trace calibration (17367)1141753531----- Attempting Submission 1 (Wed Aug 09 17:02:16 GMT 2023) -----List of Investigators has been updated.WFC3 IR Grism Flux/Trace CalibrationThis program will observe GD-153, GD-71 and GRW+70 to verify the flux calibration near the center of the field (-20, 0) and a few other positions using the WFC3 IR G102 and G141 grisms. These calibrations will be compared with those derived from previous programs:
17018 (GD-153, GD-71, GRW+70),
16583 (GD-153, GD-71, GRW+70),
16408 (GD-153, GD-71, GRW+70),
15728 (GD-153),
15587 (GD-153),
14994 (GD-153),
14544 (GD-153),
14386 (GD-153),
14024 (GD-71),
13579 (GD-153),
13092 (GD-153),
12702 (GD-71),
12357 (GD-71),
11937 (GD-71)
to check for any time evolution. The data will also be used to calculate wavelength solutions for the grisms and to check for time dependent sensitivity evolution of the G102 and G141 observing modes.Observations of GD-153 to verify the flux calibration near the center of the field and at a few other previously observed positions using the WFC3 IR G102 and G141 grisms. These calibrations will be compared with those derived from previous programs. The data will also be used to calculate wavelength solutions for the grisms, and will be used to check time dependant sensitivity of G102 and G141 observing modes.
Observations will be taken with postargs of (-20,-0) (-20,+15) (-20,-15)
Observations of GD-71 to verify the flux calibration near the center of the field and at a few other previously observed positions using the WFC3 IR G102 and G141 grisms. These calibrations will be compared with those derived from previous programs. The data will also be used to calculate wavelength solutions for the grisms, and will be used to check time dependant sensitivity of G102 and G141 observing modes.
Observations will be taken with postargs of (-20,-0) (-20,+15) (-20,-15) (-40,+0)
Direct imaging done with only one imaging filter: F098M for G102 and F140W for G141
ORIENT restrictions applied to minimize contamination in this crowded field.
Observations of GRW+70 to verify the flux calibration near the center of the field and at a few other previously observed positions using the WFC3 IR G102 and G141 grisms. These calibrations will be compared with those derived from previous programs. The data will also be used to calculate wavelength solutions for the grisms, and will be used to check time dependant sensitivity of G102 and G141 observing modes.
Observations will be taken with postargs of (-20,-0) (-20,+15) (-20,-15) (-40,+0)
Direct imaging done with only one imaging filter: F098M for G102 and F140W for G141
ORIENT restrictions applied to avoid contamination
The original flux monitor observed GD71 and GD153 at a range of detector positions but was reduced to a single orbit of GD153 based on the stability of the initial calibration. Using a longer time baseline, a decrease in sensitivity of ~0.1% per year has been measured, so GRW+70 was added (and GD71 resumed) to more accurately track these time-dependent losses.0falsefalseRESTRICTEDSTARDAAccording to ISR WFC3-2011-05, GD-153 is used as the primary flux calibrator for the WFC3 IR grisms.J2000J2000STARDAGD-71 is a primary HST flux standard that has been used in the past to calibrate the NICMOS and ACS grism modes, which provides us with the ability to cross-calibrate between instruments. GD-71 is specifically chosen for the WFC3 IR grism calibration because it will provide an aditional flux calibration target (GD-153 is used in SMOV for the IR grism calibration), so that the calibration is not based on a single target. An additional calibration target also minimizes the potential for problems from other nearby sources in the field.
The original flux monitor observed GD71 and GD153 at a range of detector positions but was reduced to a single orbit of GD153 based on the stability of the initial calibration. Using a longer time baseline, a decrease in sensitivity of ~0.1% per year has been measured, so GRW+70 was added (and GD71 resumed) to more accurately track these time-dependent losses.J2000J2000CALIBRATIONPHOTOMETRICGRW+70 is specifically chosen for the WFC3 IR grism calibration because it will provide an aditional flux calibration target (GD-153 is used in SMOV for the IR grism calibration), so that the calibration is not based on a single target. An additional calibration target also minimizes the potential for problems from other nearby sources in the field.
The original flux monitor observed GD71 and GD153 at a range of detector positions but was reduced to a single orbit of GD153 based on the stability of the initial calibration. Using a longer time baseline, a decrease in sensitivity of ~0.1% per year has been measured, so GRW+70 was added (and GD71 resumed) to more accurately track these time-dependent losses.HIP-66578J2000J = 13.25The scheduling data was generated by CASM 31.0.CASM was run in Phase II mode./Users/dsom/workarea/WFC3_projects/Cy31_cal/monitor/phaseII/WFC3_IR_grism_fluxcal/OP-cache/17367-v01.xmlVisit targetting GD153(Tic-Visit
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