def get_timezone(ifo):
try:<EOL><INDENT>return TIMEZONE[ifo]<EOL><DEDENT>except KeyError as exc:<EOL><INDENT>exc.args = ('<STR_LIT>' % ifo,)<EOL>raise<EOL><DEDENT>
Return the timezone for the given interferometer prefix

    Parameters
    ----------
    ifo : `str`
        prefix of IFO, e.g. ``'X1'``