Index: /trunk/doc/release.2015/ps1.datasystem/datasystem.tex
===================================================================
--- /trunk/doc/release.2015/ps1.datasystem/datasystem.tex	(revision 40598)
+++ /trunk/doc/release.2015/ps1.datasystem/datasystem.tex	(revision 40599)
@@ -127,4 +127,20 @@
 are described by \cite{chambers2017}.
 
+Pan-STARRS produced its first large-scale public data release, Data
+Release 1 (DR1) on 16 December 2016.  DR1 contains the results of the
+third full reduction of the Pan-STARRS $3\pi$ Survey archival data,
+identified as PV3.  Previous reductions \citep[PV0, PV1, PV2;
+  see][]{magnier2017.datasystem} were used internally for pipeline
+optimization and the development of the initial photometric and
+astrometric reference catalog \citep{magnier2017.calibration}.  The
+products from these reductions were not publicly released, but have
+been used to produce a wide range of scientific papers from the
+Pan-STARRS 1 Science Consortium members \citep{chambers2017}.  DR1
+contained only average information resulting from the many individual
+images obtained by the $3\pi$ Survey observations.  A second data
+release, DR2, was made available \note{20 January 2019}.  DR2 provides
+measurements from all of the individual exposures, and include an
+improved calibration of the PV3 processing of that dataset.
+
 This is the second in a series of seven papers describing the
 Pan-STARRS1 Surveys, the data reduction techiques and the resulting
@@ -148,5 +164,5 @@
 %The Pan-STARRS\,1 Surveys
 \citet[][Paper I]{chambers2017}
-provides an overview of the Pan-STARRS System, the design and
+provide an overview of the Pan-STARRS System, the design and
 execution of the Surveys, the resulting image and catalog data
 products, a discussion of the overall data quality and basic
@@ -162,28 +178,31 @@
 %Waters et al. 2017 (Paper III) 
 %Pan-STARRS Pixel Processing : Detrending, Warping, Stacking
-\citet[][Paper III]{waters2017}
-describes the details of the pixel processing algorithms, including detrending, warping, and adding (to create stacked images) and subtracting (to create difference images) and resulting image products and their properties. 
-
+\citet[][Paper III]{waters2017} describe the details of the pixel
+processing algorithms, including detrending, warping, and adding (to
+create stacked images) and subtracting (to create difference images)
+and resulting image products and their properties.
 
 %Magnier et al. 2017 (Paper IV) 
 %Pan-STARRS Pixel Analysis : Source Detection 
-\citet[][Paper IV]{magnier2017.analysis}
-describes the details of the source detection and photometry, including point-spread-function and extended source fitting models, and the techniques for ``forced'' photometry measurements. 
+\citet[][Paper IV]{magnier2017.analysis} describe the details of the
+source detection and photometry, including point-spread-function and
+extended source fitting models, and the techniques for ``forced''
+photometry measurements.
 
 %Magnier et al. 2017 (Paper V) 
 %Pan-STARRS Photometric and Astrometric Calibration
 \citet[][Paper V]{magnier2017.calibration}
-describes the final calibration process, and the resulting photometric and astrometric quality.  
-
+describe the final calibration process, and the resulting photometric and astrometric quality.  
 
 %Flewelling et al. 2017 (Paper VI)
 %Pan-STARRS 1 Database and Data Products
 \citet[][Paper VI]{flewelling2017}
-describes  the details of the resulting catalog data and its organization in the Pan-STARRS database. 
-%
-%
-\citet[][Paper VII]{huber2017}
+describe the details of the resulting catalog data and its organization in the Pan-STARRS database. 
+
 %Huber et al. 2017 (Paper VII)
-describes the Medium Deep Survey in detail, including the unique issues and data products specific to that survey. The Medium Deep Survey is not part of Data Release 1 or 2.
+\citet[][Paper VII]{huber2017} describe the Medium Deep Survey in
+detail, including the unique issues and data products specific to that
+survey. The Medium Deep Survey is not part of Data Releases 1 or 2 and
+will be made available in a future data release.
 
 Section~\ref{sec:overview} provides an overview of the full data
@@ -329,5 +348,5 @@
 steps are discussed in detail by
 \citet[][]{magnier2017.analysis}.  The data products from the
-camera, stack photometry, and forced-warp photometry analysis stages
+camera, stack, and forced-warp photometry analysis stages
 are ingested into the internal calibration database (DVO, the Desktop
 Virtual Observatory) and used for photometric and astrometric