Slide 1 of 5 COS Monthly Status Review David Soderblom STScI

Slide 2 of 5 STScI COS News TAGFLASH: This mode (TIME-TAG with regular comparison lamp exposures) was added to deal with OSM drifts Timing analysis showed that all lamp exposures were starting slightly late (1 to 2 sec) First flash about 2 sec late; others about 1 sec Initial time pad in commanding too large by ~1 sec; now reduced Latency in lamp turn-on is source of remaining delays; flash durations to be increased to compensate Full analysis of drift from TV2 to be completed in fall; present estimate of S/N looks OK

Slide 3 of 5 STScI COS News Exposure Time Calculator (ETC): Spectroscopic ETC is complete, but testing showed need for change (double precision in bin sizes needed, depending on platform) Acquisition and imaging ETC in progress, to be tested soon Will coordinate testing and verification with IDT Bright Object Protection checks: APT now includes access to Galex information Final check of this in APT requires ETC completion to check count rates Documents: First draft of COS Instrument Handbook in revision Second draft to be ready July 23 IDT review of second draft requested Released with CP in December

Slide 4 of 5 STScI COS News STScI-IDT SMOV Coordination: SMOV Requirements Review held at GSFC in March STScI is reviewing SMOV4 requirements; will prepare list of candidate activities STScI COS effort led by Tony Keyes COS IDT lead at STScI is David Sahnow Expectation is 50/50 split of SMOV responsibility between STScI and IDT Summary of activities to be prepared in August GSFC activity summary review scheduled for mid-October

Slide 5 of 5 7 Aug SM4 Launch 21 Mar Requirements Review by HSTP Reception area Proposal Descriptions COS SMOV4 Activity Timeline 1 March September September Jan High Priority (alignments, etc) Phase II Due Apr-Sep Activity Summary (Phase I) preparation STScI/IDT 1 Aug Reserved Target List Due (GTO) 31 Mar ERO and Balance of SMOV Phase II Due 30 Jun GTO Phase II Due 25 Oct Activity Summary Review by HSTP 1 March 2008