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IAUC 8594: 2005dp, 2005dq, 2005dr, 2005ds, 2005dt; 2005dl; N SMC 2005

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IAUC number

                                                  Circular No. 8594
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)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)

SUPERNOVAE 2005dp, 2005dq, 2005dr, 2005ds, 2005dt
     Further to IAUC 8592, E. Lee and W. Li report the LOSS
discovery of an apparent supernova (mag about 18.5) on unfiltered
KAIT images taken on Sept. 1.36 and 2.35 UT.  SN 2005dt is located
at R.A. = 23h23m38s.32, Decl. = -19o00'24".5 (equinox 2000.0),
which is 2".6 west and 11".7 north of the nucleus of MCG -03-59-6.
KAIT images taken on 2004 Oct. 22.30 (limiting mag 19.5) and 2005
Aug. 14.31 (limiting mag 19.0) showed nothing at this position.
     F. J. D. Serduke, M. R. Moore, W. Li, and A. V. Filippenko,
University of California, Berkeley, report that inspection of CCD
spectra (range 330-1000 nm), obtained on Sept. 2 UT with the Shane
3-m reflector at Lick Observatory, shows that SN 2005dp (IAUC 8591),
SN 2005dq (IAUC 8592), SN 2005ds (IAUC 8592), and SN 2005dt (above)
are young type-II supernovae, and that SN 2005dr (IAUC 8592) is a
somewhat older type-IIn supernova.  SN 2005ds may be of type IIn,
as well, but higher-quality spectra are needed to confirm this.

SUPERNOVA 2005dl IN NGC 2276
     S. Taubenberger and A. Pastorello, Max Planck Institut fuer
Astrophysik, Garching, on behalf of the European RTN collaboration
(cf. IAUC 7987), report that a spectrum of SN 2005dl (cf. IAUC
8588), obtained on Aug. 30.02 UT by F. Hoyo with the Calar Alto
2.2-m telescope (+ CAFOS; range 340-880 nm), is that of a young
type-II supernova.  The noisy spectrum is characterized by broad
P-Cyg features of the H-Balmer series and another P-Cyg line that
can probably be attributed to He I 587.6-nm.  Adopting the NED
recession velocity of 2410 km/s for the host galaxy (from Strauss
et al. 1992, Ap.J. Suppl. 83, 29), the expansion velocity
determined from H_beta is about 9200 km/s.  Supernova magnitudes
estimated from broadband photometry obtained on Aug. 30.10 with the
same instrument:  B = 18.39 +/- 0.20, V = 17.94 +/- 0.15, R =17.35
+/- 0.12, I =16.85 +/- 0.10 (the errors take into account the
uncertainties arising from a heavy contamination of the supernova
light by the galaxy background).  Host-galaxy extinction might be
present, but the S/N of the spectrum is too low to unequivocally
detect interstellar Na ID features.

     J. D. Neill reports that his observations reported on IAUC
8593 evidently refer to Liller's nova (cf. IAUC 8582).

                      (C) Copyright 2005 CBAT
2005 September 3               (8594)            Daniel W. E. Green

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