SN 1993J IIb in M81 (NGC 3031, Sab)

OBJ:  SN 1993J IIb in M81 (NGC 3031, Sab).  See
          Leda:  M81.
DISCOVERY:  1993mar28.86 UT (JD 2449075.36) by Francisco Garcia {ripero1993}.
            But there was a detection on a CCD image from 1993mar28.3 according to
            {richmond1994} p. 1029.
MAX:  1993apr17.2 UT (JD 2449094.7) in UVOIR bolometric from {richmond1994}.  This is neary V maximum too.
           See the US Navy Observatory 
           Julian Date Converter.
           This day of the year 107.
SUPERNOVA of the YEAR:  10.

HEADER:  D. J. Jeffery (2006jan01).

REF:

       {barbon1995}
\bibitem[Barbon et al.(1995)]{barbon1995}
        Barbon, R., Benetti, S., Cappellaro, E., Patat, F., Turatto, M., \&~Iijima, T.
        1995, A\&AS, 110, 513 
%ADS Reference
         % SN 1993J in M 81: One year of observations at Asiago.

       {houck1994}
\bibitem[Houck \&~Frannson(1994)]{houck1994}
    Houck, J. C., \&~Fransson, C.  1994, 
    American Astronomical Society, 185th AAS Meeting, #79.07; Bulletin of the American Astronomical Society, Vol.~26, p.~1444

% ADS reference.
     % Analysis of the Late Spectra of SN 1993J (IIb) and SN 1994I (Ic).

       {jeffery1994}
\bibitem[Jeffery et al.(1994)]{jeffery1994} Jeffery, D. J., et al. 1994, \apj, 421, L27.
%
        % ADS Reference
        % 13 coauthors.
        % A Hubble Space Telescope ultraviolet spectrum of SN 1993J in M81.
        % 1993apr15 spectrum.

       {richmond1994}
\bibitem[richmond et al.(1994)]{richmond1994}
    Richmond, M. W., Treffers, R. R., Filippenko, A. V., Paik, Y., Leibundgut, B., Schulman, E., \& Cox, C. V.
    AJ, 107, 1022

% ADS reference.
     % UBVRI photometry of SN 1993J in M81: The first 120 days. 
     % The UVOIR bolometric maximum was JD 2449094.70 +/- 1 (see p. 1035).  This is 1993apr17:4:48 = 17.2 exactly.
     % B maximum was 2449093.7 (see p. 1033).
     % V maximum was 2449095.0 (see p. 1033).
     % These are secondary maxima since there was a UV spike just after shock breackout:  the
     % decline from the spike was observed.
     % Estimate time of core collapse JD 2449074.4 +/- .2  (see p. 1029).  This is 1993mar27:21:36 = 27.9 exactly.
     % See US Navy Observatory Julian Date Converter.

   {ripero1993} The discovery IAUC.


REP:  F_lambda (erg/cm2/s/A) ??? vs. lambda (ang)  (iformat = 1)
COR:  not deredshifted ??? (heliocentric velocity -39 +/- 2 km/s (a blueshift) and 
        v_hel corrected for CMB radiation 46 km/s from
      Leda:  M81.
      not dereddened ??? (Galactic foreground .35/4... =.0875
     Schlegel et al. (1998).
      Total extinction is probably not very different.
      not smoothed ????, not photometric ????
      Derived maximum in some band is 2002apr10 (see above).

OBS:   {barbon1995}   

Date: 1993 () with 1993apr17 (107, JD 2449094.70) for bolometric maximum gives:
      day =  - 94.70 =  



&specnamelist
   aname='sn1993J IIb 1993_'
   ebv=.0875
   epoch=          ! This parameter needs to updated for the particular spectrum.
   iformat=1
   itick=2
   itickln=4
   t_rise=20.d0      ! default 
   v_helio=-39.
   ymin2=1.d-17
   ymax2=1.d-12
   ymin3=.3
   ymax3=3.
   wlammin1=
   wlammax1=
   wlammin2=
   wlammax2=
   wlammin3=
   wlammax3=
/




      

Postscript plot of the spectrum.




      

Postscript plot of the spectrum with local normalization.




Information from somewhere. 


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