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IAUC 6613: 1997bp; 1997bn

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                                                 Circular No. 6613
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
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SUPERNOVA 1997bp IN NGC 4680
     P. Marples, Loganholme, Queensland, reports the visual
discovery with a 0.31-m telescope by R. Evans (Hazelbrook, N.S.W.)
on Apr. 6.52 UT of a supernova (mag about 13.8) located 10" west
and 40" south of the center of NGC 4680 (R.A. = 12h46m55s, Decl. =
-11o38'.3, equinox 2000.0).  No star appears in this position on
the Palomar Sky Survey.  Marples confirmed the existence of a new
star visually on Apr. 6.6.
     M. Phillips, Cerro Tololo Interamerican Observatory (CTIO),
obtained a spectrogram of SN 1997bp on Apr. 7.1 UT with the CTIO
1.5-m telescope; the spectrum shows this to be a type-Ia supernova
caught near maximum light.  Offsets from the nucleus were measured
at the telescope to be about 13".0 west and 19".5 south.
     D. J. Schlegel, University of Durham, obtained a spectrogram
(range 473-724 nm) of SN 1997bp on Apr. 7 with the 4-m reflector at
CTIO.  Inspecting the uncalibrated data, A. V. Filippenko and D. C.
Leonard, University of California at Berkeley, conclude that the
object is a normal supernova of type Ia within 1 week of maximum
brightness; the red Si II absorption trough is very deep.
     L. Wang and J. C. Wheeler, University of Texas, write that a
spectrogram (range 450-720 nm) obtained with the McDonald
Observatory 2.7-m reflector (+ SPOL) on Apr. 7.2 UT also confirm
that SN 1997bp is of type Ia at maximum light; the spectrum is very
similar to the type-Ia SN 1981B at maximum light.
     P. Garnavich, P. Challis, and R. Kirshner, Harvard-Smithsonian
Center for Astrophysics, communicate that spectra were obtained at
the Multiple Mirror Telescope on Apr. 7.4 UT.  Strong, broad Si II
absorption is seen at 606.5 nm and Ca II at 368.6 nm.  The spectrum
is again confirmed to be that of a type Ia supernova at maximum.
N. Grogin obtained CCD images of NGC 4680 with the Whipple
Observatory's 1.2-m telescope on Apr. 7.3, showing that SN 1997bp
is located 14".6 west and 20".0 south of the galaxy center at
magnitude V = 14.2.

SUPERNOVA 1997bn IN UGC 4329
     W.-d. Li, Beijing Astronomical Observatory, reports a precise
position of SN 1997bn (cf. IAUC 6612), measured from unfiltered
CCD frames taken on Apr. 4:  R.A. = 8h19m02s.20, Decl. =
+21o11'01".7 (equinox 2000.0), which is 4".7 east and 7".2 south of
the galaxy's center.

                      (C) Copyright 1997 CBAT
1997 April 7                   (6613)            Daniel W. E. Green

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