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fedhere committed Sep 7, 2024
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Expand Up @@ -275,7 +275,7 @@ \subsection{Targets of Opportunity (ToO)}\label{sec:ToO}

The current LIGO-Virgo-KAGRA (LVK) GW observing run (Observing Run 4 or O4) will end before the start of LSST. Hence, GW ToOs will not commence until the start of the Observing Run 5 (O5) of the LVK detectors. We note that the start time of O5 has no expected impacts on the LSST WFD or the ToO program. Improved system performance, primarily afforded by the consistent working of three detectors (with similar sensitivity), will maximize the scientific productivity of the Rubin ToO program while reducing the impact on other programs. Two working LIGO detectors at their design sensitivity, combined with a third detector working at 30-50\% that of LIGO, will reduce the skymaps to tractable sizes for rapid Rubin coverage. We encourage the LVK science collaboration and the International Gravitational Wave Network (IGWN), to prioritize a high-performing system with three working detectors over an early start of the O5 run.

As the GW component of the ToO program takes the largest amount of time and has the most impact on WFD, to enable optimal use of Rubin resources, {\it the SCOC recommends that a meeting to follow Rubin ToO 2024 is organized closer to the start of O5 to refine the GW follow-up survey strategy with improved knowledge of the expected performance of the GW detector networks and systems in O5 and of the performance of the full Rubin system.}
As the GW component of the ToO program takes the largest amount of time and has the most impact on WFD, to enable optimal use of Rubin resources, {\bf the SCOC recommends that a meeting to follow Rubin ToO 2024 is organized closer to the start of O5 to refine the GW follow-up survey strategy with improved knowledge of the expected performance of the GW detector networks and systems in O5 and of the performance of the full Rubin system.}
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There is no comparable time restriction for the solar system ToO program (to follow up potentially hazardous asteroids) or neutrino ToO program (to follow-up high energy neutrinos or those from a Galactic supernova). Hence, {\bf the SCOC recommends that the solar system and neutrino ToOs should start as soon as possible: as soon as suitable templates are available.}
Expand Down Expand Up @@ -326,7 +326,7 @@ \subsection{Deep Drilling Fields (DDF)}\label{sec:DDF}
\incomplete{The implementation of DDF intranight visits is still under development, retaining sequences of visits in multiple filters within a night, providing opportunities for fainter per-night measurements as well as sub-minute sampling for limited times.
Tradeoffs between nightly depth, cadence, season length, and filter balance are still being explored, but the SCOC is able to make some further recommendations based on input from the SCOC DDF Task Force.}

{\bg The SCOC recommends that DDF observations should be sequences of multiple WFD-like visits (as opposed to increased exposure times) to allow rapid alert generation.}
{\bf The SCOC recommends that DDF observations should be sequences of multiple WFD-like visits (as opposed to increased exposure times) to allow rapid alert generation.}
This also benefits $\sim$minute timescale science and cross-calibration of DDF and WFD observations.

{\bf The SCOC recommends that the baseline translational dithering scale of DDF observations should be reduced from 0.7 degrees to 0.2 degrees (with exploration of even smaller translational dithers compatible with instrumental signature removal and calibration needs).
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