The GCN LVC Circulars

1) Mail your submission to "lvccirc@capella2.gsfc.nasa.gov".
    NOTE: This is NOT the same address as the regular Circular submissions.
2) Similar to the regular Circulars, the email Subject-line must contain at least one of the following case-sensitive strings:
    "LIGO", "Virgo", "VIRGO", or "LVC".
3) Your submission will be checked against the LVC-vetted list,
    and you will receive a 'success' report or a 'problem' report (which offers solutions to what went wrong).
4) The TITLE, SERNUM, SUBJECT, DATE, & FROM will be prepended
    to the body of your email submission, and will then be distributed.

The LVC Circulars (LIGO/Virgo Collaboration Circulars) are the same as the original Circulars,
but are separated out to a different submission/distribution list during the Proprietary Phase of LVC operations.

They contain information, results, conclusions about LVC Events and the potential/verified candidate counterparts detected in the EM band.

Operationally, there are only two differences between the Original Circulars and the LVC-Circulars:
1) You submit them to the "lvccirc@capella2.gsfc.nasa.gov" address (not the gcncirc@capel..." address).
    (If you submit an LVC-related Circ to the regular Circ address, it will be rejected.)
2) The Subject line in the email submission must also contain one of the following strings:
    "LVC", "LIGO", "Virgo", and "VIRGO" (note that VIRGO in all-capitals is NOT the correct form of the Virgo project,
    but it is included here if people type it in all-caps in their haste to get the circular submitted).
    Some example Subject lines might look like:
          LIGO/Virgo G123456: Fermi-GBM trigger 123456789 has temporal coincidence
          LIGO/Virgo G123456: Swift-XRT identifies 6 potential candidates
          LIGO/Virgo G123456: Continued observations of iPTF Counterpart #3 shows fading
          LIGO/Virgo G123456: List of near-term future observation regions by Project ABCD
    (In fact, it is strongly encouraged by the LVC that the Subject line begin with: LIGO/Virgo Gnnnnnn
    where 'nnnnnn' is the trigger number.)

POST-PROPRIETARY PHASE:

Once the proprietary phase is over, the LVC Circulars will be made public
(they will be merged in with the regular Circulars archive, ADS, etc).

THE ORIGINAL CIRCULARS:

Beyond the two differences listed above, everything else about the LVC Circulars is the same as the regular Circulars, described here.