SPECTRUM LOG:

     JD times for the SN 1981b spectra of branch1983.

     branch1983 only gave whole number values, but by comparing UT dates
     and knowing the observations were done in Texas and so
     at the .25 +/- .25 of the UT day, we know that the JD's have to end
     in .75 +/- .25.
     I can't imagine that the man down the hall has any better information
     although the folks at the McDonald Observatory in Texas may have some archived times.

     Bmax 1981mar07.21 UT (JD 2444670.71 +/- 0.88) (riess2005).  Now prefered.
     Bmax JD 2444672.0 +/- 0.2 (krisciunas2000).

     From the 7600 A telluric line, I know a few of the spectra are
     in the rest frame, and I suppose they all are.
     Nope.  The 1981mar27 spectrum is observer-frame.

     JD Bmax  Heliocentric velocity (Leda, 2007jul01)
     4670.71   1807.
 
 
     Heliocentric velocity     Z redshift
           1807.0000000000   0.0060275032
 
     Index     JD of some kind Observer phase     Rest phase
 
         1     4671.2500000000   0.5400000000   0.5367646494     ! branch1983     1981mar07.75   3081.60--8390.37 (rest from telluric)
         2        0.0000000000******************************     !                               4-day averaged spectrum.
         3     4676.7500000000   6.0400000000   6.0038120039     ! branch1983     1981mar13.25   5623.00--7134.06 (rest?)
         4     4687.7500000000  17.0400000000  16.9379067131     ! branch1983     1981mar24.25   3656.27--8658.24 (rest from telluric)
         5     4690.7500000000  20.0400000000  19.9199325428     ! branch1983     1981mar27.25   3509.66--8703.33 (observed from telluric)
         6     4694.7500000000  24.0400000000  23.8959669825     ! branch1983     1981mar31.25   3398.46--8756.76 (rest from telluric)
         7     4698.7500000000  28.0400000000  27.8720014222     ! branch1983     1981apr04.25   missing spectrum unless the apr05 spectrum
         8        0.0000000000******************************     !                               is really a an apr04-apr05 average.
         9     4699.7500000000  29.0400000000  28.8660100322     ! branch1983     1981apr05.25   3705.07--6398.59 (rest?)
        10     4705.7500000000  35.0400000000  34.8300616917     ! branch1983     1981apr11.25   3842.52--6300.77 (rest?)
        11     4719.7500000000  49.0400000000  48.7461822306     ! branch1983     1981apr25.25   4344.48--7068.86 (rest?)
        12     4728.7500000000  58.0400000000  57.6922597199     ! branch1983     1981may04.25   3299.13--5387.26 (rest?)
        13     4734.7500000000  64.0400000000  63.6563113794     ! branch1983     1981may10.25   5655.51--7162.68 (rest?)
        14     4765.7500000000  95.0400000000  94.4705782870     ! branch1983     1981jun10.25   3369.02--6206.58 (rest?)
        15     4786.7500000000 116.0400000000 115.3447590954     ! branch1983     1981jul01.25   4184.47--7165.75 (rest?)
        16     4940.7500000000 270.0400000000 268.4220850235     ! mcdonald1981   1981dec02.25   2660.90--5641.74 (?)   (harkness)
        17     4941.2500000000 270.5400000000 268.9190893285     ! mcdonald1981   1981dec02.75   2660.90--7194.90 (?)   (harkness)
        18        0.0000000000******************************     !                               May be an average of dec02 and dec03.
        19     4941.7500000000 271.0400000000 269.4160936334     ! mcdonald1981   1981dec03.25   4192.31--7194.90 (?)   (harkness)
        20     4996.7500000000 326.0400000000 324.0865671792     ! mcdonald1981   1982jan27.25   3120.16--5665.77 (?)   (harkness)
        21     5027.7500000000 357.0400000000 354.9008340868     ! mcdonald1982   1982feb27.25   4196.02--7182.89 (?)   (harkness)
        22     5028.7500000000 358.0400000000 355.8948426967     ! mcdonald1982   1982feb28.25   3262.64--5926.60 (?)   (harkness)