@property<EOL><INDENT>def epoch(self):<DEDENT>
try:<EOL><INDENT>if self._epoch is None:<EOL><INDENT>return None<EOL><DEDENT>return Time(*modf(self._epoch)[::-<NUM_LIT:1>], format='<STR_LIT>', scale='<STR_LIT>')<EOL><DEDENT>except AttributeError:<EOL><INDENT>self._epoch = None<EOL>return self._epoch<EOL><DEDENT>
GPS epoch associated with these data

        :type: `~astropy.time.Time`