import time


def timestamp_to_gmtime(ts):
    """Return a string formatted for GMT
    
    >>> print(timestamp_to_gmtime(1196705700))
    2007-12-03 18:15:00 UTC (1196705700)
    >>> print(timestamp_to_gmtime(None))
    ******* N/A *******     (    N/A   )
    """
    if ts:
        return "%s (%d)" % (time.strftime("%Y-%m-%d %H:%M:%S UTC", time.gmtime(ts)), ts)
    else:
        return "******* N/A *******     (    N/A   )"