! $Id: 5646,v 2.1 1994/07/27 20:04:21 pepsa Exp $ coverpage: title_1: WF/PC2 CYCLE 4 CAL: CTE DITHER TEST proposal_for: CAL/WFC pi_fname: MARK pi_lname: CLAMPIN pi_inst: STSCI pi_country: USA pi_phone: (410) 338-4711 wf_pc: Y abstract: line_1: Previous photometric analysis of the Omega Cen field line_2: has revealed an apparent 10% ramp across each CCD in line_3: the direction of the columns (parallel register). line_4: Flatfielding does not remove the effect nor does it line_5: appear to be intrinsic to the flatfields; it is also line_6: seen in cosmic ray analysis of long dark frames. The line_7: purpose of this proposal is to quantify the effect in line_8: an efficient manner by obtaining five images (each line_9: offset slightly from the previous one) of the Omega line_10: Cen photometric field along the WFPC2 X direction and line_11: four images along the Y direction, again each image line_12: offset somewhat from the previous ones. The pointings, line_13: specified with postargs, will be arranged to ensure the line_14: maximum starfield overlap. The F555W filter is used line_15: along with the exposure times from the IDT's SMOV line_16: dither test, which will facilitate direct comparisons line_17: with the earlier data. general_form_proposers: lname: CLAMPIN fname: MARK inst: STSCI country: USA lname: BAGGETT fname: SYLVIA inst: STSCI country: USA general_form_text: question: 2 section: 1 line_1: These calibration tests are required to characterize line_2: the 10% ramp effect seen in the Y direction. question: 3 section: 1 line_1: Two sets of F555W images will be obtained: one line_2: set will run along the WFPC2 Y direction and one line_3: set along the WFPC X direction. Each image will line_4: be slightly offset from the others; the pattern line_5: of the pointings is in the shape of a '+'. question: 5 section: 1 line_1: The first "USE" should be scheduled to run once line_2: as soon as possible. Note that additional line_3: repeats have been included in the event that line_4: further tests are required; they should only be line_5: run if requested by PI. general_form_address: lname: CLAMPIN fname: MARK category: PI addr_1: 3700 San Martin Drive city: Baltimore state: MD zip: 21218 country: USA phone: (410) 338-4711 lname: BAGGETT fname: SYLVIA mi: M category: CI addr_1: 3700 San Martin Drive city: Baltimore state: MD zip: 21218 country: USA phone: (410) 338-5054 fixed_targets: targnum: 1 name_1: OMEGA-CEN descr_1: J,702 pos_1: RA = 13H 25M 37.04S +/- 0.1S, pos_2: DEC = -47D 35' 38.3" +/- 1.0" equinox: 2000 fluxnum_1: 1 fluxval_1: V=14.5 targnum: 2 name_1: NGC6752 descr_1: J,702 pos_1: RA = 19H 10M 08.24S +/- 0.1S, pos_2: DEC = -59D 50' 25.3" +/- 1.0" equinox: 2000 comment_1: ALTERNATE TARGET IN THE EVENT THAT comment_2: OMEGA-CEN IS UNAVAILABLE fluxnum_1: 1 fluxval_1: V=14.5 exposure_logsheet: linenum: 101.000 targname: OMEGA-CEN sequence_1: DEF OMEGA config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 40S priority: 1 param_1: ATD-GAIN = 15,CR-SPLIT=NO req_1: CYCLE 4/ 101-109; req_2: SAME ORIENT FOR 102-109 AS 101; comment_1: SAME GUIDE STARS FOR 102-109 AS 101; comment_2: CENTER OF PATTERN (NO POSTARG) linenum: 102.000 targname: OMEGA-CEN sequence_1: DEF OMEGA config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 40S priority: 1 param_1: ATD-GAIN = 15,CR-SPLIT=NO req_1: POS TARG +15, 0 linenum: 103.000 targname: OMEGA-CEN sequence_1: DEF OMEGA config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 40S priority: 1 param_1: ATD-GAIN = 15,CR-SPLIT=NO req_1: POS TARG +30, 0 linenum: 104.000 targname: OMEGA-CEN sequence_1: DEF OMEGA config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 40S priority: 1 param_1: ATD-GAIN = 15,CR-SPLIT=NO req_1: POS TARG -15, 0 linenum: 105.000 targname: OMEGA-CEN sequence_1: DEF OMEGA config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 40S priority: 1 param_1: ATD-GAIN = 15,CR-SPLIT=NO req_1: POS TARG -30, 0 linenum: 106.000 targname: OMEGA-CEN sequence_1: DEF OMEGA config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 40S priority: 1 param_1: ATD-GAIN = 15,CR-SPLIT=NO req_1: POS TARG 0, +15 linenum: 107.000 targname: OMEGA-CEN sequence_1: DEF OMEGA config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 40S priority: 1 param_1: ATD-GAIN = 15,CR-SPLIT=NO req_1: POS TARG 0, +30 linenum: 108.000 targname: OMEGA-CEN sequence_1: DEF OMEGA config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 40S priority: 1 param_1: ATD-GAIN = 15,CR-SPLIT=NO req_1: POS TARG 0, -15 linenum: 109.000 targname: OMEGA-CEN sequence_1: DEF OMEGA config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 40S priority: 1 param_1: ATD-GAIN = 15,CR-SPLIT=NO req_1: POS TARG 0, -30 linenum: 501.000 sequence_1: USE OMEGA req_1: CYCLE 4/ 501-505 comment_1: RUN SEQUENCE ONCE ASAP linenum: 502.000 sequence_1: USE OMEGA comment_1: CONTINGENCY USE: TO BE INVOKED ONLY comment_2: AT REQUEST OF PI linenum: 503.000 sequence_1: USE OMEGA comment_1: CONTINGENCY USE: TO BE INVOKED ONLY comment_2: AT REQUEST OF PI linenum: 504.000 sequence_1: USE OMEGA comment_1: CONTINGENCY USE: TO BE INVOKED ONLY comment_2: AT REQUEST OF PI linenum: 505.000 sequence_1: USE OMEGA comment_1: CONTINGENCY USE: TO BE INVOKED ONLY comment_2: AT REQUEST OF PI !~~~RPSS~~~,SIB_WFPC2,ctedither.prop,12-APR-1994 15:16