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. 
END:
4671.25         ! branch1983     1981mar07.75   3081.60--8390.37 (rest from telluric) 
0.              !                               4-day averaged spectrum. 
4676.75         ! branch1983     1981mar13.25   5623.00--7134.06 (rest?)
4687.75         ! branch1983     1981mar24.25   3656.27--8658.24 (rest from telluric) 
4690.75         ! branch1983     1981mar27.25   3509.66--8703.33 (observed from telluric)
4694.75         ! branch1983     1981mar31.25   3398.46--8756.76 (rest from telluric) 
4698.75         ! branch1983     1981apr04.25   missing spectrum unless the apr05 spectrum 
0.              !                               is really a an apr04-apr05 average.
4699.75         ! branch1983     1981apr05.25   3705.07--6398.59 (rest?)
4705.75         ! branch1983     1981apr11.25   3842.52--6300.77 (rest?) 
4719.75         ! branch1983     1981apr25.25   4344.48--7068.86 (rest?) 
4728.75         ! branch1983     1981may04.25   3299.13--5387.26 (rest?) 
4734.75         ! branch1983     1981may10.25   5655.51--7162.68 (rest?) 
4765.75         ! branch1983     1981jun10.25   3369.02--6206.58 (rest?) 
4786.75         ! branch1983     1981jul01.25   4184.47--7165.75 (rest?)
4940.75         ! mcdonald1981   1981dec02.25   2660.90--5641.74 (?)   (harkness) 
4941.25         ! mcdonald1981   1981dec02.75   2660.90--7194.90 (?)   (harkness) 
0.              !                               May be an average of dec02 and dec03.
4941.75         ! mcdonald1981   1981dec03.25   4192.31--7194.90 (?)   (harkness)
4996.75         ! mcdonald1981   1982jan27.25   3120.16--5665.77 (?)   (harkness)
5027.75         ! mcdonald1982   1982feb27.25   4196.02--7182.89 (?)   (harkness)
5028.75         ! mcdonald1982   1982feb28.25   3262.64--5926.60 (?)   (harkness)