Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8448b&link_type=abstract
HST Proposal ID #8448
Computer Science
Hst Proposal Id #8448
Scientific paper
NOTE: THIS PROPOSAL HAS A DECON LINK. VISIT 22 IS DONE BEFORE A DECON. VISIT 23 IS DONE AFTER THAT SAME DECON. PLEASE PICK A DECON THAT OCCURS BETWEEN 1-MAR-1999 AND 1-MAY-2000. Using both INTFLAT and VISFLAT observations, this WFPC2 proposal is designed to monitor the pixel to pixel flatfield response and the VISFLAT lamp degradation, as well as detect any possible changes due to contamination. This proposal is a subset of the cycle 7 calibration program 7623/WFPC2 Cycle 7 Internal Flats {the monitoring portion has been moved to the cycle 8 program WFPC2 Decons and Associated Observations}. To conserve the VISFLAT lamp lifetime, the number and frequency of VISFLAT observations have been significantly reduced compared to previous cycles; the current plan is to obtain a mini-sweep of VISFLATs before and after a decon, once during the cycle. In addition, VISFLATs will be taken with a ramp filter, one at each gain, to be done at the post-decon visit, to provide a check of the A-to-D correction. The INTFLAT portion of this proposal will consist of a set of filter sweeps and a linearity test. The INTFLAT images will provide a backup database in the event of complete failure of the VISFLAT lamp as well as allow monitoring of the gain ratios. The monitor visits consist of exposures in the 5 standard broad-band filters while the sweep is a complete set of internal flats cycling through both shutter blades and both gains. The linearity test will obtain a series of INTFLAT with both gains and both shutters. Since the INTFLATs have significant spatial structure, any non linearity would appear as a non-uniform ratio of INTFLATs with different exposure times. A set of exposures is also taken with gain 7, shutter B, and clocks=YES.
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