added history, motivation, and context slides

index.html

@@ -91,17 +91,77 @@ <h1>General<br>Coordinates<br>Network</h1>
     <section data-markdown>
       <textarea data-template>
         # Gamma-ray<br>Coordinates<br>Network
+      </textarea>
+      </section>
+
+      <section>
+        <div class="image-and-caption">
+          <div>
+            <h2>Realtime Alerts <br> Born of Necessity</h2>
+            <img
+              src="img/cgro-with-batse-diagram.jpg"
+              alt="CGRO with BATSE Instrument"
+              width="800"
+            />
+          </div>
+          <div data-markdown>
+            <textarea data-template>
+              * Compton Gamma-ray Observatory onboard recorder failed in 1992 
+              * Opportunity to stream science data to the ground in realtime 
+              * BAtse COordinates DIstribution NEtwork (BACODINE) was built to receive those alerts and distribute them to the worldwide follow-up community
+            </textarea>
+          </div>
+        </div>
+      </section>
 
-        ---
+      <section>
+        <div data-markdown>
+          <textarea data-template>
+            ## Early History of GCN
+            <img
+              src="img/gcn_history.pdf"
+              alt="GCN history timeline"
+              width="1500"
+            />
+            * BACODINE provided new alert formats (phone, email, socket and pager)
+            * As new triggering observatories were added, it evolved into the Gamma-ray burst Coordinates Network
+          </textarea>
+        </div>
+      </section>
+
+      <section>
+        <div class="image-and-caption">
+          <img
+            src="img/GCN_classic_logo.gif"
+            alt="GCN Classic Logo"
+            width="700"
+          />
+          <div data-markdown>
+            <textarea data-template>
+              * GCN became the Gamma-ray Coordinates Network serving additional transient source types
+              * Enabled seminal breakthroughs in astrophysics by rapidly connecting astronomers using public Internet infrastructure
+            </textarea>
+          </div>
+        </div>
+      </section>
 
-        * History, motivation, major discoveries
-        * What's changed in the scientific landscape
-          * Time-domain astronomy has become mainstream
-          * Multimessenger astronomy
-        * What's changed in the infrastructure technology landscape
-          * What problems with GCN we wanted to solve
-          * Why Kafka
+      <section data-markdown>
+        <textarea data-template>
 
+        * GCN Products
+          * Machine-readable notices (plain text, VOEvent, 160-bye binary) by space and ground-based observatories
+          * GCN Circulars - currated community email message board (>30k to date)
+        ---
+        * GCN Modernization
+          * Self-service (consumers) rather than curated access
+          * High reliability and availability
+          * Straightforward workflow for instrument teams to update message schema and database
+          * Secure connections and message verification
+          * Infrastructure for development of rich ecosystem of web applications
+        * New GCN implementation 
+          * Apache Kafka protocol widely adopted within optical transient community (e.g. Rubin)
+          * Rich environment of open source and commercial tools
+
         ---
 
         # Introducing<br>the new GCN