SN 1998bw Ic_hyp in ESO 184-G82 (SBbc)

OBJ:  SN 1998bw Ic_hyp in ESO 184-G82 (SBbc)
             according to Leda.
DISCOVERY:   1998may01 by \citet{galama1998}
MAX:  1998may10 UT (JD 2450943.8) in B from \citet{patat2001}.
           See the US Navy Observatory Julian Date Converter.
           This day of the year 130.
DATE of Explosion:  This was coincident with GRB 980425, and the assumed explosion was thus 1998apr25.
                    This day of the year 115.

SUPERNOVA of the YEAR:  M = 75.

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


REF:

\citep{galama1998}
\bibitem[Galama et al.(1998)]{galama1998} Galama, T., et al. 1998, Nature, 395, 670
       % About 48 coauthors.
%
% ADS reference
       % An unusual supernova in the error box of the gamma-ray burst of 25 April 1998.
       % The discovery paper for SN 1998bw, the famous SN Ic_hypernova coincident with
       % GRB 980425.

\citep{iwamoto1998}
\bibitem[Iwamoto et al.(1998)]{iwamoto1998}
    Iwamoto, K., et al. 1998, Nature, 395, 672

% ADS reference.
     % About 27 coauthors.  Paolo's 2nd author.
     % A hypernova model for the supernova associated with the gamma-ray burst of 25 April 1998.
     % SN 1998bw Ic_hypernova.

\citep{patat2001}
\bibitem[Patat et al.(2001)]{patat2001} Patat, F., et al. 2001, \apj, 555, 900
        %
        % ADS Reference
         % 46 coauthors including all the usual suspects.
         % The Metamorphosis of SN 1998bw.
         % The big ESO paper on light curves and spectra.


REP:  F_lambda (cgs-A) vs. lambda (ang)
COR:  NOT deredshifted (z=.0085\pm.0002 [Galama etal;  Iwamoto etal] or
        heliocentric velocity 2550\pm60 km/s.
        Using H_0=65, this is 39\pm1 Mpc away [Iwamoto etal]).
        But \citet{patat2001} give 2532 km/s from narrow line observations.
      NOT checked against photometry and so absolute calibration may be off.
      NOT dereddened ????  Iwamoto et al assumed 0. total reddening
         and since no other corrections have been done, I assume
         no dereddening either.
         But Galama etal. from the Schlegel etal maps say
           A_V_foreground=.20.
         My evaluation from the Schlegel etal maps give
           E(B-V)_foreground=.05853 which for R=3.1 is A_V_forground=.1814.
           So who is right.  Me, I'd say.  But they are more expert.
         Leda doesn't give a heliocentric velocity and gives foreground E(B-V)=.25/4=.0625
     ESO 184-G82 (SBbc)

OBS:  Not clear, but reported in \citet{patat2001}.


Date: 199 () with 2005may10 (JD 2450943.8) for B maximum gives:
      day =  - 943.8 =   (See JD in FITS information below).  




&specnamelist
   aname='sn1998bw Ic_hyp 1998_'
   ebv=.065
   epoch=       ! This parameter needs to updated for the particular spectrum.
   iformat=1
   itick=2
   itickln=4
   t_rise=14.4      ! \citep{patat2001}, p. 905
   v_helio=2532.
   ymin2=1.d-15
   ymax2=6.d-15
   ymin3=.5
   ymax3=2.1
   wlammin1=
   wlammax1=
   wlammin2=
   wlammax2=
   wlammin3=
   wlammax3=
/




      

Postscript plot of the spectrum.




      

Postscript plot of the spectrum with local normalization.




FITS: Fits format information from the observers.