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IAUC 7668: Prob. SN IN Anon GALAXY; V2274 Cyg = N Cyg 2001

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                                                  Circular No. 7668
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)

     P. Challis, Harvard-Smithsonian Center for Astrophysics, on
behalf of the High-Z Supernova Search Team (cf. IAUC 6160, 6646),
using methods inspired by the SNAZ (SuperNovae at High Z) Team at
the Space Telescope Science Institute,  reports the discovery of a
probable supernova on WFPC2 images taken with the Hubble Space
Telescope.  The apparent supernova was found by differencing images
taken on June 20 UT with earlier WFPC2 data taken over six epochs
during Nov.-Dec. 2000.  The new object appears in five filters
during the 3-orbit (about 5-hr) observation.  It does not exhibit the parallax
motion of a solar-system object.  The supernova is offset 0".4
southeast of the center of an elongated faint (F814W magnitude
about 24.1) galaxy.  The position of the new object is R.A. =
2h30m17s.62, Decl. = +1 03'56".4 (equinox 2000.0; uncertainty +/-
0".04).  A finder chart is available at
Photometry from the WFPC2 data yields the following supernova
magnitudes:  [F450W] = 26.00 +/- 0.30, [F555W] = 25.07 +/- 0.16,
[F675W] = 23.91 +/- 0.06, [F814W] = 23.59 +/- 0.06, [F850LP] =
23.45 +/- 0.16.  Further observations with HST will be coordinated
by the SNAZ Team.  Groundbased observations should be possible in
the R, I, and Z bands.

     N. N. Samus, Institute of Astronomy, Moscow, informs us that
the designation V2274 Cyg has been given to this nova (cf. IAUC
     T. Kato, Kyoto University, reports the following prediscovery
limiting magnitudes (nova not visible):  May 12.775 UT, [14.0 (A.
Takao, Kitakyushu, Japan; unfiltered CCD); 19.665, [11.9 (K.
Kanatsu, Matsue, Shimane, Japan; T-Max 400 film); June 15.621,
[11.9 (Kanatsu); July 12.613, [11.6 (Kanatsu).
     E. O. Waagen, AAVSO, reports the following additional CCD V
magnitudes in the AAVSO International Database:  July 19.072 UT,
12.2 (A. Price, Waltham, MA); 19.090, 11.95 (Walker); 19.138, 11.87
(Walker); 19.159, 11.93 (Walker); 19.292, 11.86 (S. O'Connor,
Montreal, QC); 20.058, 11.88 (Walker); 20.086, 11.81 (Walker);
20.096, 11.87 (Walker); 20.102, 12.2 (Price); 20.262, 12.0 (R.
Royer, Lakewood, CA).

                      (C) Copyright 2001 CBAT
2001 July 20                   (7668)            Daniel W. E. Green

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