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Observation Strategy Update

Detailed analysis of observation options for improved all-sky coverage and enhanced exposure of the Galactic Center. Evaluation of different pointing directions and update frequencies to optimize observation efficiency and uniformity.

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Observation Strategy Update

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  1. Last time we met, we discussed option1 and option 2, which are a mix of pointed mode and survey mode observations Improved coverage of galactic center, but loss of all-sky coverage at short timescales. Option 3, 4, 5 restore all-sky coverage on 2 orbit timescales, give better all-sky uniformity while maintaining improved coverage of galactic center Achieve this by choosing pointing direction on orbit equator and update weekly or daily. Observation Strategy Update Option 1 Option 2

  2. Options 3, 4, 5 3 4 Survey 5

  3. More quantitatively • Option 5 is the most uniform

  4. Observing efficiency • Observation efficiency is decreased when the LAT FoV is occulted by the Earth

  5. Minimum exposure • Reasonable coverage on entire sky for option 3, 4 and 5

  6. Galactic Center Exposure • Options 3, 4 and 5 all show similar coverage on Galactic Center

  7. Observatory technical studies • Thermal studies • Make sure that nothing gets too hot or two cold • Slew times per orbit • Can’t easily schedule data downlinks during periods of high slew • Reaction wheel studies • Simulations to evaluate impact on reaction wheels, look at mitigations if needed.

  8. Next Steps • Updated webpage • Set up google discussion group to host comments/discussion about the proposed change.

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