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IAUC 8514: 2005bo; 2005bl; 2005bk

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IAUC number


                                                  Circular No. 8514
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


SUPERNOVA 2005bo IN NGC 4708
     Further to IAUC 8509, T. Puckett and A. Langoussis report the
discovery of an apparent supernova (mag 15.3) on an unfiltered CCD
frame taken with the 0.60-m automated supernova patrol telescope on
Apr. 17.13 UT.  The new object was confirmed at mag 15.2 on CCD
frames taken on Apr. 18.05.  SN 2005bo is located at R.A. =
12h49m41s.03, Decl. = -11o05'47".3 (equinox 2000.0), which is 7".6
west and 12".7 south of the center of NGC 4708.  Nothing is visible
at this location on images taken by Puckett on 2002 Mar. 12 and
2003 Mar. 24 (limiting mag about 20.0).  SN 2003ef also occurred
in NGC 4708 (cf. IAUC 8131).


SUPERNOVA 2005bl IN NGC 4059
     N. Morrell, G. Folatelli, M. Phillips, C. Contreras, and M.
Hamuy, Carnegie Supernova Project, report that an optical spectrum
(range 320-940 nm) of SN 2005bl (cf. IAUC 8512), obtained on Apr.
16.13 UT with the Las Campanas 2.5-m du Pont telescope (+ WFCCD
spectrograph), reveals it to be a type-Ia supernova similar to the
subluminous SN 1999by, probably a few days before maximum light.
Strong Ti II absorption troughs are present at about 420 and 590
nm.  The expansion velocity derived from the minimum of the Si II
635.5-nm line is 11000 km/s, assuming the recession velocity for
NGC 4059 given by the NED database.
     J. Galagher and P. Garnavich, University of Notre Dame; and M.
Modjaz, R. Kirshner, and P. Challis, Harvard-Smithsonian Center for
Astrophysics, report that a spectrum (range 340-730 nm) of SN
2005bl, obtained on Apr. 16.15 UT by Galagher and Garnavich with
the F. L. Whipple Observatory 1.5-m telescope (+ FAST), shows it to
be a type-Ia supernova. The noisy spectrum is similar to spectra of
SN 1999by (Garnavich et al. 2004, Ap.J. 613, 1120), taken a few
days before maximum, indicating that this may be a subluminous
event.


SUPERNOVA 2005bk IN MCG +07-33-27
      M. Ganeshalingam, R. J. Foley, D. S. Wong, F. J. D. Serduke,
and A. V. Filippenko, University of California, Berkeley, report
that inspection of CCD spectra (range 330-1000 nm), obtained on
Apr. 17 UT with the Shane 3-m telescope at Lick Observatory, shows
that SN 2005bk (IAUC 8512) is of type Ic, similar to SN 1994I
(Filippenko et al. 1995, Ap.J. 450, L11), about 1 week past maximum
light.

                      (C) Copyright 2005 CBAT
2005 April 18                  (8514)            Daniel W. E. Green

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