CDROM/AJ/V107/P1453     SN 1993J (Benson+ 1994)
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Light Curves of SN 1993J from the Keck Northeast Astronomy Consortium
      P. J. Benson, W. Herbst, J. J. Salzer, G. Vinton, G. J. Hanson, 
      S. J. Ratcliff, P. F. Winkler, D. M. Elmegreen, F. Chromey, C. Strom,
      T. J. Balonek, & B. G. Elmegreen
      <1994, AJ, 107, 1453>
      =1994AJ....107.1453B
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Abstract:
  We present BVRI photometry of SN 1993J, as well as data on its likely
  progenitor.  The post-explosion data were obtained with CCDs attached to
  telescopes (aperture size 0.4 to 0.6 m) on the campuses of the Keck
  Northeast Astronomy Consortium members by the authors and their
  students.  Our data show that the supernova rose to a second maximum in
  all colors and has declined steadily since then.  This is unlike either
  the plateau or linear version of the typical Type II light curve.
  Except for the initial peak, the light curve bears a strong resemblance
  to SNe Ib, supporting suggestions that this is a Type IIb event. The
  position of the supernova, as measured on our images, agrees to within
  0.1 arcsec with the position of a faint, apparently stellar image on a
  CCD R image taken with the 0.9 m telescope at KPNO on 1992 October 2.
  The likely progenitor is also visible on B and I frames taken with the
  0.9 m Burrell Schmidt telescope of the Warner and Swasey Observatory,
  Case Western Reserve University, at KPNO in 1993 February.  Examination
  of a photograph of M81 taken on 1993 March 27.1 (UT) by an amateur
  astronomer allows us to set a constraint on its brightness at that time.


File Summary:
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File Name    Lrecl    Records    Explanations
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table3.dat      52        135    KNAC photometry of SN 1993J
table3.tex      67        219    LaTeX version of table 3
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Byte-by-byte Description of file: table3.dat
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   Bytes Format  Units      Label    Explanations
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   1- 6   A6      ---       Obs      Observation date (UT)
   7-15   F9.2    day       JD       Julian Date - 2440000
  16-     1X      ---       ---      Blank
  17-22   F6.2    mag       B        []? B band magnitude
  23-28   F6.2    mag       V        []? V band magnitude
  29-34   F6.2    mag       R        R band magnitude
  35-40   F6.2    mag       I        I band magnitude
  41-42   2X      ---       ---      Blank
  43-52   A10     ---       Site     Observation site
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(End)                                             Lee Brotzman [ADS] 08-May-1994