prompt> gtephem strict=yes This is gtephem version v8r4 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|GGLAST) [MJD] MJD Time system for the reference time of this ephemeris computation (TAI|TDB|TT|UTC)) [TDB] TDB gtephem: No spin ephemeris was found in database: StrictEphChooser::choose: Could not find a spin ephemeris for 54900.0 MJD (TDB) prompt>