Electronic Telegram No. 259
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVA 2005hc IN MCG +00-6-3
     J. Barentine, Apache Point Observatory (APO); B. Bassett,
University of Portsmouth (UP); A. Becker, University of Washington;
R. Bender, University of Munich (UM); M. Bremer, University of
Bristol; H. Brewington, APO; F. DeJongh, Fermilab; J. Dembicky,
APO; D. L. DePoy, Ohio State University (OSU); B. Dilday,
University of Chicago (UC); M. Doi, University of Tokyo; A. Edge,
University of Durham; E. Elson, South African Astronomical
Observatory (SAAO); J. Frieman, Fermilab and UC; P. Garnavich,
University of Notre Dame;  A. Goobar, Stockholm University; M.
Harvanek, APO; T. Gueth and J. Holtzman, New Mexico State
University; U. Hopp, UM; W. Kollatschny, Goettingen University; J.
Krzesinski, APO; D. Lamenti, San Francisco State University; H.
Lampeitl, Fermilab; R. Kessler, UC; B. Ketzeback, APO; K. Konishi,
University of Tokyo; D. Long, APO; J. Marriner, Fermilab; J. L.
Marshall, OSU; R. McMillan, APO; J. Mendez, University of Barcelona
(UB); G. Miknaitis, Fermilab; R. Nichol, UP; K. Pan, APO; J. L.
Prieto, OSU; M. Richmond, Rochester Institute of Technology; A.
Riess, Space Telescope Science Institute; R. Romani, Stanford
University (SU); K. Romer, University of Sussex; P. Ruiz-Lapuente
(UB); M. Sako (SU); D. Schneider, Pennsylvania State University; M.
Smith, UP; S. Snedden, APO; M. Subbarao, UC and Adler Planetarium;
N. Takanashi, University of Tokyo; K. van der Heyden, SAAO; C.
Wheeler, University of Texas; and N. Yasuda, University of Tokyo,
on behalf of the Sloan Digital Sky Survey II collaboration, report
the discovery of an apparent supernova on g, r, and i images taken
with the SDSS 2.5-m telescope at Apache Point Observatory on Oct. 12
(discovery image; supernova at g = 18.5) and 14 (g approximately
18.0).  SN 2005hc is located at R.A. = 1h56m47s.9, Decl. = -0o12'49".2,
equinox 2000.0), which is approximately 9" west and 3".9 south of
the center of MCG +00-6-3; a prior SDSS spectrum shows the host
galaxy to be at redshift z = 0.0459.  Fits to the two epochs of g-,
r-, and i-band imaging suggest that 2005hc is a supernova of type Ia
that is about 7 days before g maximum on Oct. 19 and that it will
reach a peak magnitude of g around 17.
     The "Nearby Supernova Factory" group (N. Blanc, S. Bongard, Y.
Copin, E. Gangler, L. Sauge, and G. Smadja, Institut de Physique
Nucleaire de Lyon; P. Antilogus, S. Gilles, R. Pain, and R. Pereira,
Laboratoire de Physique Nucleaire et de Haute Energies de Paris; G.
Aldering, S. Bailey, D. Kocevski, B. C. Lee, S. Loken, P. Nugent, S.
Perlmutter, R. Scalzo, R. C. Thomas, L. Wang, and B. A. Weaver,
Lawrence Berkeley National Laboratory, Berkeley; C. Bonnaud and E.
Pecontal, Centre de Recherche Astronomique de Lyon; R. Kessler,
Kavli Institute for Cosmological Physics, Chicago; and C. Baltay, D.
Rabinowitz, and A. Bauer, Yale University) reports that a spectrum
(range 320-1000 nm) of SN 2005hc, obtained on Oct. 18.5 UT with the
University of Hawaii 2.2-m telescope (+ Supernova Integral Field
Spectrograph), reveals that it is a type-Ia supernova on the rise,
spectroscopically similar to SN 1994D at five days before maximum
light.  In addition to a weak Ca II infrared triplet absorption
around 10000 km/s, a stronger high-velocity (20000-25000 km/s)
component is visible, reminiscent of the type-Ia SN 2001el (Wang et
al. 2003, Ap.J. 591, 1110).


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2005 CBAT
2005 October 19                  (CBET 259)               Daniel W. E. Green