Electronic Telegram No. 2287
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Room 209; Dept. of Earth and Planetary
 Sciences; Harvard University; 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbat@iau.org; cbatiau@eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


SUPERNOVAE 2010cq AND 2010cv-2010cz
     Further to CBETs 2234 and 2280, A. J. Drake, S. G. Djorgovski, A.
Mahabal, M. J. Graham, and R. Williams, California Institute of Technology;
J. L. Prieto, Carnegie Observatories; M. Catelan, Pontificia Universidad
Catolica de Chile; R. H. McNaught, Australian National University; E. C.
Beshore and S. M. Larson, Lunar and Planetary Laboratory, University of
Arizona; and E. Christensen, Gemini Observatory, report the discovery of
several apparent supernovae in unfiltered Catalina Sky Survey (CSS) and
Siding Spring Survey images:

 SN       2010 UT        R.A. (2000.0) Decl.      Mag.      Offset
 2010cv   Apr.  9.18    9 36 19.28  +29 21 01.3   18.8        --
 2010cw   Apr. 11.24    9 33 56.84  +38 48 35.7   17.8    1".6 E, 1".7 S
 2010cx   May   5.33   13 00 31.43  +41 44 44.4   18.3    1".1 W
 2010cy   May  13.39   14 43 42.85  + 3 58 16.2   17.0    1".0 E, 3".1 N
 2010cz   May  15.81   22 40 56.89  - 7 03 06.4   17.8    15".9 W, 16".8 N

Further CSS magnitudes for 2010cv:  Mar. 19.27 UT, [20.5; Apr. 17.18, 18.9;
May 6.23, 19.6.  Further CSS magnitudes for 2010cw:  Mar. 19.28, [19.2; May
11.17, 18.8.  Further CSS magnitudes for 2010cx:  Mar. 19.30, [20.4; May
15.30, 18.5; May 17.33, 18.5.  Further CSS magnitudes for 2010cy:  Apr. 9.31,
[18.0; May 5.38, 17.5.  Further magnitudes for 2010cz:  2009 Nov. 17, [19.5
(Mount Lemmon Survey); 2010 May 17.4, 18.2 (J. Brimacombe, Cairns, Australia;
unfiltered images taken remotely with a telescope near Mayhill, NM, U.S.A.).
The host galaxy (2 Micron All Sky Survey eXtended source J2240579-070323) for
2010cz has redshift z = 0.041 (6dF Galaxy Survey; cf. Jones et al. 2004,
MNRAS 355, 747).
     J. Prieto, Carnegie Observatories, reports that optical spectra (range
370-950 nm; resolution 0.7nm) of 2010cq (cf. CBET 2280), 2010cx, and 2010cy
were obtained with the Apache Point Observatory 3.5-m telescope (+ DIS) on
May 16 UT.  After cross-correlation with a library of supernova spectra using
SNID (Blondin and Tonry 2007, Ap.J. 666, 1024), the following spectral
classifications were made:  2010cx is a normal type-II supernova at z = 0.03
(redshift from the supernova spectrum) a few weeks after explosion; 2010cy is
a normal type-Ia supernova at z = 0.0389 (redshift from emission lines in the
host galaxy) around maximum light; and 2010cq is a normal type-Ia supernova
at z = 0.0275 (redshift from the Sloan Digital Sky Survey) about three weeks
after maximum.  After correcting the spectrum of 2010cy for the recession
velocity of its host galaxy, the velocity of the Si II 635.5-nm absorption
trough is measured to be 10500 km/s.


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

                         (C) Copyright 2010 CBAT
2010 May 18                      (CBET 2287)              Daniel W. E. Green