Central Bureau for Astronomical Telegrams
IAUC 7636: 2001cf; 2001ba, 2001bf, 2001bk, 2001bt; 2001bs
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Circular No. 7636
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 2001cf IN UGC 7020
G. Sala, Azzate, Italy, reports the discovery with the 0.3-m
reflector at Promiod Observatory of an apparent supernova (mag
18.5) on unfiltered CCD images (limiting mag 19.5) taken on May
26.87 and 26.93 UT. The new object is located at R.A. =
12h02m31s.64, Decl. = +41o02'58".9 (equinox 2000.0), which is 49".3
west and 19".1 south of the nucleus of UGC 7020. V. Pozzoli,
Bareggio, Italy, confirmed the new object on unfiltered CCD images
taken at the J. B. Postel Observatory on May 26.96, adding that
both Palomar Sky Surveys show nothing at the position of SN 2001cf;
he also adds that the new object is only about 7" from a foreground
star of red mag 16.9 in the USNO-A2.0 catalogue.
A. V. Filippenko and R. Chornock, University of California at
Berkeley, report that inspection of a CCD spectrum (range 390-1000
nm), obtained on May 29 UT with the Keck-II 10-m reflector, reveals
that SN 2001cf is a type-IIb supernova like SN 1993J (Filippenko et
al. 1993, Ap.J. 415, L103). H-alpha absorption is strong, but
lines of He I with P-Cyg profiles are also prominent. The
recession speed of the host galaxy (from NED) is 6130 km/s.
SUPERNOVAE 2001ba, 2001bf, 2001bk, 2001bt
M. Phillips, Carnegie Observatories; and K. Krisciunas, Cerro
Tololo Interamerican Observatory, report on spectra obtained with
the Du Pont 2.5-m telescope at Las Campanas Observatory on May
17-18 and 26-27 UT. SN 2001bf (cf. IAUC 7620, 7625) is a type-Ic
event, similar in appearance to SN 2000H (cf.
http://cfa-www.harvard.edu/cfa/oir/Research/supernova/spectra/sn00h.gif).
SN 2001bk (cf. IAUC 7624) is a type-II supernova at z about 0.043
with strong, broad, P-Cyg H-alpha emission. SN 2001bt is a type-Ia
event that was at or near maximum in a spectrum obtained on May 26.
Corrigenda. On IAUC 7614, SN 2001ba, the R.A. offset should
read 15".8 east. On IAUC 7633, SN 2001bt, the R.A. offset should
read 14".1 west.
SUPERNOVA 2001bs IN UGC 10018
A. V. Filippenko and R. Chornock, University of California at
Berkeley, report that a CCD spectrum (range 390-1000 nm), obtained
on May 29 UT with the Keck-II 10-m reflector, reveals that SN
2001bs (cf. IAUC 7631) is a normal type-Ia supernova, about 1 week
past maximum brightness.
(C) Copyright 2001 CBAT
2001 May 29 (7636) Daniel W. E. Green
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