prompt> gtephem strict=yes This is gtephem version ScienceTools-v9r17p0-fssc-20100630 Pulsar ephemerides database file name[] bogus_pulsardb.fits Pulsar name[ANY] PSR J9999+9999 Reference time at which to find/compute ephemeris[0.] 54900.0 Time format for the reference time of this ephemeris computation (MJD|ISO|FERMI|GLAST) [MJD] MJD Time system for the reference time of this ephemeris computation (TAI|TDB|TT|UTC) [TDB] TDB gtephem: Spin ephemeris estimated is: gtephem: Reference Time : 54900 MJD (TDB) gtephem: Ephemeris Data : Not Available prompt>