clarifying use of snap time in summary

Author: fedhere

additional.tex

@@ -19,6 +19,6 @@ \section{Additional changes introduced in \texttt{v3.6} \opsim s }\label{sec:ops
 Starting with \texttt{v3.6} some important assumptions underlying the simulations were updated: 
 \begin{itemize}
 \item Increased downtime in Y1 to reflect a more realistic transition into operations. The downtime in Y1 is simulated to be maximal early on and decreased to the level expected for the general LSST survey by the end of the first year. 
-\item The effect of jerk on slew time is now included in the simulations, and thus included in scheduling choices. Functionally this slightly increases the overhead and decreases survey efficiency.
+\item The effect of jerk on slew time is now included in the simulations, and thus included in scheduling choices. Functionally, this slightly increases the overhead and decreases survey efficiency.
 \end{itemize}
 

summaryrecommendation.tex

@@ -1,5 +1,5 @@
 \section{Summary of SCOC Phase 3 recommendations}\label{sec:summary}
-The following list summarizes the Phase 3 recommendations for the LSST survey strategy which together with the recommendations in \citetalias{PSTN-053} and \citetalias{PSTN-055} define the LSST survey strategy starting plan.   The recommendations included in this report are listed below.
+The following list summarizes the Phase 3 recommendations for the LSST survey strategy which, together with the recommendations in \citetalias{PSTN-053} and \citetalias{PSTN-055}, define the10-year LSST survey strategy starting plan.   The recommendations included in this report are listed below.
 
 \begin{itemize}
 \item The SCOC recommends swapping $u$- and $y$-band according to the moon phase. Having the $z$ filter always available  produces benefits for SN cosmology while preserving coverage on short timescales. This recommendation is implemented starting in \baseline{3.2} (\autoref{sec:filterswap}).
@@ -38,7 +38,7 @@ \section{Summary of SCOC Phase 3 recommendations}\label{sec:summary}
 
 \item 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). (\autoref{sec:DDF}).
 
-\item The SCOC recommends that the baseline survey strategy should accommodate varying the nightly depth, filters, or cadence of different DDFs throughout the course of LSST, while maintaining the Phase 2 recommendations for the 10-year depth of each field (including the enhanced COSMOS observations to reach 10-year depth in the first 3 years) (\autoref{sec:DDF}).
+\item The SCOC recommends that the baseline survey strategy should accommodate varying the nightly depth, filters, or cadence of different DDFs throughout the course of LSST, while maintaining the Phase 2 (\citep{PSTN-055}) recommendations for the 10-year depth of each field (including the enhanced COSMOS observations to reach 10-year depth in the first 3 years) (\autoref{sec:DDF}).
 
 \item The SCOC urges the Data Management and Alert Production teams to assess the feasibility of, and resources needed for, enabling nightly co-adds of sequential DDF visits and recommends that a path is developed to enable the creation of these co-adds, subtraction with deep templates, and faint alert generation (with higher latency as needed, \eg , after sunrise) (\autoref{sec:DDF}). 
 
@@ -50,7 +50,7 @@ \section{Summary of SCOC Phase 3 recommendations}\label{sec:summary}
 
 These recommendations will be implemented in the \baseline{4.0} simulations. A set of simulations tagged \texttt{v3.6} is made available for the community to assess the impact of different aspects of the recommendation. Note that all of these simulations include the updated, more realistic downtime and effects of slew jerk. 
 
- \autoref{fig:summary} shows the performance of the survey strategy on a set of core LSST science and system metrics. Note: Significant improvements were obtained on most metrics through v3.0. Those are to be attributed to changes of the survey strategy through community input and SCOC recommendations. The visible improvement on nearly all metrics between \baseline{3.2} and \baseline{3.3} is attributed to the updated filter transmission curves. The survey strategy is largely unchanged between \baseline{3.3} and \baseline{3.4}; the small changes in performance are to be attributed to  \texttt{rubin\_scheduler} code updates.\footnote{See \url{https://survey-strategy.lsst.io/baseline/changes.html}}. \baseline{3.6} reflects the recommendations described in this document. The overall apparent drop in performance between \baseline{3.4} and \baseline{3.6} is primarily due to the inclusion of slew time jerk effects and more realistic estimates of downtime in Y1 (\autoref{sec:opsimchanges}). While \baseline{3.6} has three rolling cycles, we also make available a variation of \baseline{3.6} with four cycles of rolling to enable the investigations of different rolling implementations. While our recommendation is to implement the ToO program as described in \autoref{sec:ToO}, we provide an \opsim\ consistent with \baseline{3.6}, but without the ToO program to allow the community, to see the small effects that the introduction of ToOs has on the LSST. Finally we provide an implementation of \baseline{3.6} with single exposure visits (instead of 2x15 second snaps, \autoref{sec:snaps}) which, pending commissioning outcomes, is the expected observing mode. In this \opsim, the survey time gained by dropping snaps (decreased readtime per visit) is allocated evenly across all all-sky observing modes: this includes the WFD, NES, SCP and Galactic Plane.
+ \autoref{fig:summary} shows the performance of the survey strategy on a set of core LSST science and system metrics. Significant improvements were obtained on most metrics through v3.0. Those are to be attributed to changes of the survey strategy through community input and SCOC recommendations. The visible improvement on nearly all metrics between \baseline{3.2} and \baseline{3.3} is attributed to the updated filter transmission curves. The survey strategy is largely unchanged between \baseline{3.3} and \baseline{3.4}; the small changes in performance are to be attributed to  \texttt{rubin\_scheduler} code updates.\footnote{See \url{https://survey-strategy.lsst.io/baseline/changes.html}}. \baseline{3.6} reflects the recommendations described in this document. The overall apparent drop in performance between \baseline{3.4} and \baseline{3.6} is primarily due to the inclusion of slew time jerk effects and more realistic estimates of downtime in Y1 (\autoref{sec:opsimchanges}). While \baseline{3.6} has three rolling cycles, we also make available a variation of \baseline{3.6} with four cycles of rolling to enable the investigations of different rolling implementations. While our recommendation is to implement the ToO program as described in \autoref{sec:ToO}, we provide an \opsim\ consistent with \baseline{3.6}, but without the ToO program to allow the community, to see the small effects that the introduction of ToOs has on the LSST. Finally we provide an implementation of \baseline{3.6} with single exposure visits (instead of 2x15 second snaps, \autoref{sec:snaps}) which, pending commissioning outcomes, is the expected observing mode. In this \opsim, the survey time gained by dropping snaps (decreased readtime per visit) is allocated evenly across all all-sky observing modes: this includes the WFD, NES, SCP and Galactic Plane. In the future, with better knowledge of the system as built, the SCOC will consider how the additional time may be allocated, including to special programs (\eg, microsurveys), DDFs, WFD, etc., either to compensate for unexpected performance loss or to increase science throughput.
 
 
 \begin{figure}

texmf/bibtex/bib/lsst.bib

@@ -7351,7 +7351,7 @@ @Misc{PSTN-055
 }
 
 @Misc{PSTN-056,
-    author = "federica bianco (she/her/hers)",
+    author = "Federica Bianco and the Survey Cadence Optimization Committee",
     title = "{Survey Cadence Optimization Committee’s Phase 3 Recommendations}",
     publisher = "{Vera C. Rubin Observatory}",
     year = "2024",