SN 1990B Ic in NGC 4568 (Sbc)

OBJ:   SN 1990B Ic in NGC 4568 (Sbc).  In Leda it is
          NGC 4568 (Leda).
DISCOVERY: 1990jan21 UT by Perlmutter & Pennypacker (1990) of the Berkeley Automated Supernova Search.
          CfA List of Supernovae.
MAX:  1990jan18.5 +/- 1 (JD 2447910.) in B according to {clocchiatti2001}.  But this is 
           just an estimate since Bmax preceded discovery.
           See the US Navy Observatory Julian Date Converter.
           This day of the year 18.
SUPERNOVA of the YEAR:  2.

SPECTROSCOPY LOG:

         Spectrum               Date                  Phase relative to Bmax        Wavelength Range
         {matheson2001}         1990jan23               +4.5                        4200--8197.5 (observed)
         {clocchiatti2001}      1990feb04              +16.5                        3705--8015 (observed)
         {matheson2001}         1990feb11              +23.5                        3420--9799 (observed)
         {clocchiatti2001}      1990feb16              +28.8                        3386.6--8685.6 (observed)
         {clocchiatti2001}      1990feb17              +29.5                        3451--7788 (observed)
         {clocchiatti2001}      1990feb20              +32.6                        3923--8259 (observed)
         {matheson2001}         1990feb27              +39.5                        4200--8197.5 (observed)
         {clocchiatti2001}      1990mar01              +42.5                        3623--7924 (observed)
         {clocchiatti2001}      1990mar08              +48.8                        3528--9950 (observed)
         {matheson2001}         1990mar25              +65.5                        3948--9798 (observed)
         {matheson2001}         1990apr01              +72.5                        3948--9798 (observed)
         {clocchiatti2001}      1990apr18              +89.7                        3578--10030 (observed)
         {matheson2001}         1990apr30             +101.5                        3930--9799 (observed)
         {matheson2001}         1990jun15             +147.5                        6720--9849 (observed)

REF:
       citet{clocchiatti2001} Photometry and spectra. 

       citet{matheson2001} Spectra of SN 1990N Ic and other
        hydrogen-deficient supernovae. 

       SUSPECT Index. 

       SUSPECT Index:  SN 1990B Ic.


HEADER: Header Common header information for this supernovae.
        The common header may (or may not) be updated relative to the header information above
        (D. J. Jeffery (2007jan01)).

COR:  not deredshifted ??? (heliocentric velocity 2254 +/- 6 km/s and 
          NGC 4568 (Leda).
     I'll trust Leda just for consistency.
      not dereddened ??? (Galactic foreground .14/4=.035
          NGC 4568 (Leda).
     Schlegel et al. (1998).
      not smoothed ????, not photometric ????
      Derived maximum in some band is  (see above).

COMMENT:

OBS:  

Date: 1990jan (JD ) with 1990jan18.5 (JD 2447910.) for B maximum gives:
      day =  -  = 



&specnamelist
   aname='sn1990b Ic 1990_01_'
   ebv=.035            ! This is foreground.  {clocchiatti2001} suggests total ebv = 0.9 to 1.5, but this really uncertain.
   epoch=              ! This parameter needs to updated for the particular spectrum.
   iformat=1           ! This has to be checked for every spectrum. 
   itick=2
   itickln=4
!   scale_flux=1.d-15
   t_rise=20.          ! Fiducial guess for hydrogen deficient supernovae.
   v_helio=2254.
   ymin2=.001e-15
   ymax2=2.e-15
   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. 

FITS: Fits format information from the observers if there is any.

END: