Supernova 2002bu in NGC 4242

This page is devoted to information on Supernova 2002bu in NGC 4242 Basic information on this SN, including the last reported brightness, on this Supernova can be found on the main page.  Information on the original web pages for many of these images can be found on the updates and links web pages.

This is a type IIn supernova found in a galaxy which is in Canes Venatici. This galaxy is part of CVn cloud II, which is associated with the Virgo cluster. We have a DSS Photometry reference image made by Odd Trondal.  Icon generated from Tim Puckett's discovery image.

Web pages dedicated to this SN.
• SNWeb has a 2002bu page
• Josch Hambsch 2002bu page.

The following is a list of images of this SN, in chronological order. Click on the name in the "observer" column to see the image. Times and dates are in UT unless otherwise noted. If you know of any others, please tell me!

Image Credit	Date	Mag	Filter	Comments
Tim Puckett image	2002/03/28.26	15.5	C	Discovery
Diego Rodriguez image	2002/03/30.98		C
A Leroy image	2002/03/31.024	15.2	CR
Rafael Ferrando image	2002/03/31.828	14.96	CR
Josch Hambsch image	2002/04/01.982	15.0	C
Kopernik image	2002/04/02.125	14.90 14.84 14.84	B R C
Rezman obs image	2002/04/02.853		C
A Leroy image	2002/04/04.888		CR
Fred Ewalt image	2002/04/05.114	15.0	C
C. Leyrat image	2002/04/05.868	15.1	CR
J.B. De Vanssay image	2002/04/08.988	15.6	CR
R. Poncy image	2002/04/09.849	15.4	CR
Fred Ewalt	2002/04/11.173	15.5	C	color version
Josch Hambsch image	2002/04/13.901	15.8	C
Arnaud Leroy image	2002/04/13.953		CR
Pedro Re' image	2002/04/15.872	15.25	C
R. Poncy image	2002/04/16.886	15.8	CR
Esteban Reina Lorenz image	2002/04/20.885	15.4	CR
Eric Barbotin image	2002/04/24.905	15.8	CR
J.B. De Vanssay image	2002/04/24.985	16.0	CR
JM Llapasset image	2002/05/14.926	15.7:	CR
Pedro Re' image	2002/05/15.958	14.94	C
JB DeVanssay image	2002/05/15.983	16.2	CR
A. Leroy image	2002/05/18.967	15.96	CR
J. Nicolas image	2002/05/29.847	16.1	CR
R. Poncy image	2002/05/31.892	16.0	CR
J. Nicolas image	2002/06/03.881	16.6	CR
JM Llapasset image	2002/06/11.896	16.2	CR
R. Poncy image	2002/06/28.865	16.7	CR

Light curves and Spectra:
• CfA spectrum Taken 2002/04/03 showing a type IIn on the rise.
• Aude Measurements and light curve.
• VSNET Light curve (requires JAVA).

Other VSNet data on this SN (which will be copied here until VSNET gets it archive working again):
• [vsnet-campaign-sn 387] SN 2002bu in NGC 4242

  Dear SN watchers,

  A nearby (nearer than the Virgo cluster) SN is discovered at mag 15.5. The expected maximum for the typical SN Ia is mag about 11.7.

  SN 2002bu is discovered on Mar. 28.26 UT at Puckett Observatory. The position of the SN is: R.A. = 12h17m37s.18, Decl. = +45o38'47".4 (2000.0), which is about 73" east and 98" north of the center of the somewhat irregular-shaped (SAB(s)dm) galaxy NGC 4242. Because of the large angular diameter (5'.0 x 3'.8), there are many foregroud stars superimposed on this galaxy. And, H II regions and large clusters of stars are also populous. The identification of SN should be done carefully.

  NGC 4242 is a member of a nearby group of galaxy called "Canes Venatici II cloud", whose mean redshift is about 750 km/s. The expected maximum for the typical SN Ia is mag about 11.7, and even if it is of type-II, it can become brighter than mag 14. The spectroscopic confirmation and the followup photometries are surely urged.

  Sincerely Yours,
  Hitoshi Yamaoka, Kyushu Univ., Japan
  yamaoka@rc.kyushu-u.ac.jp

• [vsnet-campaign-sn 391] SN 2002bu spectrum

  Dear SN watchers,

  We have submitted an article below to CBAT.

  SUPERNOVA 2002bu IN NGC 4242
  K. Ayani and T. Kawabata, Bisei Astronomical Observatory (BAO); and H. Yamaoka, Kyushu University, report: "We obtained a low-resolution spectrum (range 400-700 nm; resolution 0.7 nm) of SN 2001bu (IAUC 7863) with the BAO 1.01-m reflector on Mar. 31.66 UT. It shows a flat continuum with strong and narrow (FWHM about 1100 km/s) Balmar emission lines, which indicates that it is of type IIn. The redshifts of emission lines are about 600 km/s, which is consistent with that of NGC 4242.

  H. Yamaoka