Update site-personnel.md: Added Postbac Associate role

site-personnel.md

@@ -104,6 +104,7 @@ A few fields use limited options and will not accept any text other than the bel
     * **Investigator:** An individual with substantial scientific involvement in the LTER, but who is not a Co-Principal Investigator(s). LTER Investigators need not be funded by the project.
     * **Postdoctoral Associate:** An individual with a doctoral-level degree who does research at the site, but does not hold a permanent position. Generally Postdocs are less than 5 years post-degree.
     * **Graduate Student:** A part-time or full-time student working on the project in a research capacity who holds at least a bachelor's degree and is enrolled in a degree program leading to an advanced degree.  
+    * **Postbac Associate:** A recent graduate in a short-term training position. (i.e. Postbac, as distinguished from an ongoing technical or research position.)  
     * **Undergraduate Student:** A student working on the project in a research capacity who is enrolled in a degree program (part-time or full-time) leading to a bachelor's or associate's degree. 
     * **Information Manager:** A person at an LTER site that spends some or all of their time in the process of data and information management. This person may or may not be the site representative to the information management committee.
     * **Education Manager:** A person at an LTER site that spends some or all of their time in the process of education/outreach. This person may or may not be the site representative to the education/outreach committee.