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.

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))