16408

This program will observe GD-153 to verify the flux calibration near the center of the field and at a couple of new positions using the WFC3 IR G102 and G141 grisms. The data will be used also to calculate wavelength solutions for the grisms comma and will be compared with those derived from previous programsdoublePoint 15728 15587 15728 14994 14544 14386 14024 13579 13092 12702 12357 to check for any time evolution of the calibration. This program will also observe GD-71 and GRW+70 to verify flux calibration and check time dependent sensitivity evolution of the G102 and G141 observing modes by comparing with previous observation (most recent programs being 14024 and 13575 for GD-71 and GRW+70 comma respectively).