! $Id: 5645,v 3.1 1994/07/27 20:03:59 pepsa Exp $ coverpage: title_1: WF/PC2 CYCLE 4: OPTIMUM PREFLASH TIME 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: Analysis of Omega Cen calibration fields line_2: has revealed what appears to be a variation of ~10% across each CCD in line_3: the direction of the columns (parallel register). line_4: On the basis of analysis done by the WFPC2 Science Team and STScI we line_5: have established the following facts: line_6: 1) A variation of ~10% is seen in Omega Cen images across each chip in line_7: the direction of the columns (parallel register). line_8: 2) This effect is not removed by flat fielding, nor, does it appear to line_9: be intrinsic to the flat fields themselves. line_10: 3) It is also seen in analysis of cosmic ray events in long dark line_11: frames. line_12: 4) Pre-assembly engineering data does not appear to show the effect line_13: (John Trauger). line_14: This proposal will determine the proper - and minimum - preflash time line_15: required to compensate for the 10% variation. A series of F555W line_16: exposures will be taken, each preflashed at different levels. line_17: Set of 15 preflash times will span the range of ~5e- to 200e-. ! general_form_proposers: lname: CLAMPIN fname: MARK inst: STSCI country: USA lname: BAGGETT fname: SYLVIA inst: STSCI country: USA general_form_text: question: 3 section: 1 line_1: These observations will be used to determine the line_2: preflash time required to remove the 10% photometric line_3: ramp. This is a contingency proposal and should be line_4: run only after request from 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: NGC5139 descr_1: J,702 pos_1: RA = 13H 25M 37.04S +/- 0.1S, pos_2: DEC = -47D 35' 38.3" +/- 1.0" equinox: 2000 comment_1: NGC5139 IS THE PRIMARY TARGET 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: NGC6752 IS ALTERNATE TARGET comment_2: IN THE EVENT OMEGA CEN CAN NOT comment_3: BE USED fluxnum_1: 1 fluxval_1: V=14.5 exposure_logsheet: linenum: 1.000 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO req_1: CYCLE 4 / 1.0-15.2 ; req_2: SEQ 1.0-15.2 WITHIN 7D; comment_1: UNPREFLASHED EXPOSURE linenum: 1.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 0.6S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: CYCLE 4 / 1.1-15.2 ; req_2: SEQ 1.1-15.2 WITHIN 7D; req_3: SEQ 1.1-1.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 1.2 linenum: 1.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 2.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 1.8S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: SEQ 2.1-2.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 2.2 linenum: 2.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 3.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 3.0S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: SEQ 3.1-3.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 3.2 linenum: 3.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 4.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 4.0S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: SEQ 4.1-4.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 4.2 linenum: 4.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 5.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 5.0S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: SEQ 5.1-5.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 5.2 linenum: 5.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 6.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 6.0S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: SEQ 6.1-6.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 6.2 linenum: 6.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 7.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 7.0S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: SEQ 7.1-7.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 7.2 linenum: 7.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 8.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 8.0S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: SEQ 8.1-8.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 8.2 linenum: 8.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 9.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 10.0S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: SEQ 9.1-9.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 9.2 linenum: 9.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 10.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 12.0S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: SEQ 10.1-10.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 10.2 linenum: 10.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 11.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 14.0S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: SEQ 11.1-11.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 11.2 linenum: 11.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 12.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 16.0S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: SEQ 12.1-12.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 12.2 linenum: 12.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 13.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 18.0S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: SEQ 13.1-13.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 13.2 linenum: 13.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 14.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 20.0S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: SEQ 14.1-14.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 14.2 linenum: 14.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 15.100 sequence_1: DEF OMEGA targname: INTFLAT config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F122M,F1042M num_exp: 1 time_per_exp: 23S priority: 1 param_1: ATD-GAIN=15,READ=NO, param_2: CR-SPLIT=NO req_1: SEQ 15.1-15.2 NON-INT comment_1: THIS IS PREFLASH FOR LINE 15.2 linenum: 15.200 sequence_1: DEF OMEGA targname: NGC5139 config: WFPC2 opmode: IMAGE aperture: WFALL sp_element: F555W num_exp: 1 time_per_exp: 12S priority: 1 param_1: ATD-GAIN=15,CR-SPLIT=NO linenum: 100.000 sequence_1: USE OMEGA req_1: CYCLE 4 / 100.000 comment_1: RUN SEQUENCE ONLY comment_2: UPON REQUEST OF PI !~~~RPSS~~~,SIB_WFPC2,prefrange.prop,12-APR-1994 09:49