def frame2ut1(tstart, kineticsec, rawind):
<EOL>try:<EOL><INDENT>return datetime2unix(tstart)[<NUM_LIT:0>] + (rawind - <NUM_LIT:1>) * kineticsec<EOL><DEDENT>except TypeError:<EOL><INDENT>return<EOL><DEDENT>
if you don't have GPS & fire data, you use this function for a software-only
    estimate of time. This estimate may be off by more than a minute, so think of it
    as a relative indication only. You can try verifying your absolute time with satellite
    passes in the FOV using a plate-scaled calibration and ephemeris data.
    Contact Michael Hirsch, he does have Github code for this.