docs: def packet_synopsis(url_encoded_ivorn=None):
      """
      Result:
          Nested dict providing key details, e.g.::
  
              {"coords": [
                              {
                                  "dec": 10.9712,
                                  "error": 0.05,
                                  "ra": 233.7307,
                                  "time": "2015-10-01T15:04:22.930000+00:00"
                              },
                              ...
                          ],
               "refs":   [
                              {
                                  "cite_type": u"followup",
                                  "description": "This is the XRT Position ...",
                                  "ref_ivorn": "ivo://nasa.gsfc.gcn/SWIFT#BAT_..."
                              },
                              ...
                          ],
               "voevent": {
                              "author_datetime": "2015-10-01T15:04:46+00:00",
                              "author_ivorn": "ivo://nasa.gsfc.tan/gcn",
                              "ivorn": "ivo://nasa.gsfc.gcn/SWIFT#BAT_GRB_Pos_657286-112",
                              "received": "2015-11-19T20:41:38.226431+00:00",
                              "role": "observation",
                              "stream": "nasa.gsfc.gcn/SWIFT",
                              "version": "2.0"
                          }
               "relevant_urls": [ "http://address1.foo.bar",
                                  "http://address2.foo.bar"
                                  ]
              }
  
  
      Returns some key details for the packet specified by IVORN.
  
      The required IVORN should be appended to the URL after ``/synopsis/``
      in :ref:`URL-encoded <url-encoding>` form.
  
      """
      ivorn = validate_ivorn(url_encoded_ivorn)
  
      voevent_row = db_session.query(Voevent).filter(
          Voevent.ivorn == ivorn).one()
  
      cites = db_session.query(Cite). \
          filter(Cite.voevent_id == voevent_row.id).all()
      coords = db_session.query(Coord). \
          filter(Coord.voevent_id == voevent_row.id).all()
  
      v_dict = voevent_row.to_odict(exclude=('id', 'xml'))
  
      cite_list = [c.to_odict(exclude=('id', 'voevent_id')) for c in cites]
      coord_list = [c.to_odict(exclude=('id', 'voevent_id')) for c in coords]
  
      relevant_urls = lookup_relevant_urls(voevent_row, cites)
  
      result = {'voevent': v_dict,
                'refs': cite_list,
                'coords': coord_list,
                'relevant_urls': relevant_urls,
                }
  
      return jsonify(make_response_dict(result))