Merge pull request #3 from lsst-sitcom/u/kbechtol/ccr1

Update for CCR1

SITCOMTN-061.tex

@@ -15,7 +15,7 @@
 % \setDocSubtitle{A subtitle}
 
 \author{%
-Keith Bechtol, Anastasia Alexov, Chuck Claver, Leanne Guy, Robert Lupton, Kevin Reil, Steve Ritz, Austin Roberts
+Keith Bechtol, Anastasia Alexov, Chuck Claver, Holger Drass, Leanne Guy, Robert Lupton, Kevin Reil, Steve Ritz, Austin Roberts
 }
 
 \setDocRef{SITCOMTN-061}
@@ -38,6 +38,7 @@
 % See LPM-51 for version number policy.
 \setDocChangeRecord{%
   \addtohist{1}{2023-10-30}{Initial Release}{Keith Bechtol}
+  \addtohist{2}{2024-10-24}{Update for Construction Closeout Reviews}{Keith Bechtol}
 }
 
 
@@ -61,14 +62,15 @@ \section{Overview}
 \begin{itemize}
   \item the retirement of major technical risks to overall system performance (including delivered image quality and system throughput),
   \item reduced uncertainty on the remaining Construction schedule, and
-  \item an increased emphasis on bulk data collection to support science verification and validation activities leading up to the Operations Readiness Review.
+  \item an increased emphasis on bulk data collection to support science verification and validation activities leading up to the Construction Closeout Reviews.
 \end{itemize}
 
 Section \ref{criteria} provides a set of quantitative criteria to define the System First Light milestone, and Section \ref{dataset} describes an example test dataset.
 
 The System First Light milestone will be used by Rubin Observatory Operations to more accurately gauge the start date of the 10-year LSST survey and to prepare for Early Science, including the Data Previews and start of Alert Production \citedsp{RTN-011} \href{https://rtn-011.lsst.io/}.
-As of early 2023, it is expected that Data Preview 1 will be based on a subset of science-grade images taken with LSSTCam during a period of a few days around the System First Light milestone.
-System First Light is also a widely publicized milestone for external stakeholders (e.g., \href{https://ls.st/dates}{ls.st/dates}), with anticipated celebratory events, media coverage, and release of images to preview the scientific potential of Rubin Observatory (e.g., color coadd images and difference images to illustrate the detection of transient, variable, and/or moving objects).
+%As of mid-2024, it is expected that Data Preview 1 will be based on a subset of science-grade images taken with ComCam.
+% during a period of a few days around the System First Light milestone.
+System First Light is a widely publicized milestone for external stakeholders (e.g., \href{https://ls.st/dates}{ls.st/dates}), with anticipated celebratory events, media coverage, and release of images to preview the scientific potential of Rubin Observatory (e.g., color coadd images and difference images to illustrate the detection of transient, variable, and/or moving objects).
 
 In current planning, System First Light follows 2-3 months of on-sky engineering activities that begin with LSSTCam First Photon.
 \textbf {LSSTCam First Photon} is defined as the first image of the night sky produced by photons passing through the Rubin optical system and detected by LSSTCam.
@@ -80,16 +82,16 @@ \section{System First Light Criteria}
 By the System First Light milestone, we are confident that
 
 \begin{enumerate}
-  \item members of the commissioning team (not necessarily Operations team) are able to observe any set of target fields with airmass $\leq 2$ and acquire science images for at least an hour without interruption at a cadence similar to the baseline LSST survey (i.e., $\sim90$ visits per hour with each visit corresponding to a standard 30-second total exposure),
-  \item those data can be characterized using metrics defined for Priority 1a requirements from the LSR \citedsp{LSE-29} and OSS \citedsp{LSE-30} related to single-visit image quality in the $r$ band + at least two of the $giz$ bands,
+  \item members of the commissioning team (not necessarily Operations team) are able to observe a set of target fields with airmass $\leq 2$ and acquire science images for at least an hour without interruption at a cadence similar to the baseline LSST survey (i.e., $\sim90$ visits per hour with each visit corresponding to a standard $\sim30$-second total exposure);
+  \item those data can be characterized with respect to system-level science performance requirements described in LSR \citedsp{LSE-29} and OSS \citedsp{LSE-30}, associated with the CCR1 and CCR2 phases, related to single-visit image quality in the $r$ band + at least two of the $giz$ bands;
   \item those data meet the following specifications for intrinsic system performance to be acceptable for LSST science:
   \begin{enumerate}
-    \item median system contribution to delivered image quality (adjusted to zenith) less than 0.7 arcseconds across the full focal plane for $r$- and $i$-band images
-    \item median system throughput integral (atmosphere removed or using a standard atmosphere) known to within 10\% uncertianty to meet minimum specifications defined in the SRD (expressed as image depth for point sources as in Table 6) converted to instrumental zeropoints \citedsp{SMTN-002},
-    \item performance of the LSSTCam as installed on the TMA is consistent with expectations based on acceptance testing at SLAC and re-verification on Level 3, and consistent with supporting SRD requirements (e.g., system read noise, usable pixel fraction, dynamic range),
+    \item median system contribution to delivered image quality (adjusted to zenith) less than 0.7 arcseconds across the full focal plane for $r$- and $i$-band images;
+    \item median system throughput integral (atmosphere removed or using a standard atmosphere) known to within 10\% uncertianty to meet minimum specifications defined in the SRD (expressed as image depth for point sources as in Table~6) converted to instrumental zeropoints \citedsp{SMTN-002};
+    \item performance of the LSSTCam as installed on the TMA is consistent with expectations based on acceptance testing at SLAC and re-verification on Level 3, and consistent with supporting LSR requirements (e.g., system read noise, usable pixel fraction, dynamic range);
   \end{enumerate}
-  \item system telemetry, raw and basic ISR-corrected images, as well as diagnostics for single-visit science performance sampled at multiple locations on the focal plane are visible to observers on the summit within 5 minutes of acquiring the visits,
-  \item following automated data transfer and ingest at USDF, the data management system is functionally capable of both building a 3-band color coadd image and producing difference images from these data that have sufficient information content to support creation of ``press-ready'' images,
+  \item system telemetry, raw and basic ISR-corrected images, as well as diagnostics for single-visit science performance sampled at multiple locations on the focal plane are visible to observers on the summit within 5 minutes of acquiring the visits;
+  \item following automated data transfer and ingest at USDF, the data management system is functionally capable of both building a 3-band color coadd image and producing difference images from these data that have sufficient information content to support creation of ``press-ready'' images;
   \item there exists a well understood technical path towards satisfying the Construction Completeness criteria \citedsp{SITCOMTN-005} with minimal technical or schedule risks, including meeting all performance requirements in the SRD at their minimum specifications or better during the LSST 10-year survey.
 \end{enumerate}