Electronic Telegram No. 2456
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbatiau@eps.harvard.edu (alternate cbat@iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2010hv
     G. Pignata and M. Cifuentes, Universidad Andres Bello; J. Maza, M. Hamuy,
R. Antezana, L. Gonzalez, P. Gonzalez, S. Silva, G. Folatelli, R. Cartier, F.
Forster, and S. Marchi, Universidad de Chile; B. Conuel, Wesleyan University;
and D. Reichart, K. Ivarsen, J. Haislip, A. Crain, D. Foster, M. Nysewander,
and A. LaCluyze, University of North Carolina at Chapel Hill, on behalf of
the CHASE project, report the discovery of an apparent supernova (mag
approximately 15.6) on an unfiltered image taken on Aug. 28.07 UT with the
0.41-m 'PROMPT 3' telescope located at Cerro Tololo.  The new object is
located at R.A. = 23h24m25s.30 +/- 0".1, Decl. = -19o02'14".4 +/- 0".1
(equinox 2000.0), which is on top of the nucleus of the galaxy 2MASX
J23242536-1902139.  Nothing is visible at this position on archival images
taken on Aug. 2.15 (limiting mag 18.5), but 2010hv is also present in images
taken on Aug. 18.18 (mag approximately 15.1), on Aug. 24.11 (mag
approximately 15.4), and Aug. 31.10 (mag approximately 15.6).

     An optical spectrum (range 360-920 nm) obtained with the Las Campanas
2.5-m du Pont telescope (+ WFCCD) on Sept. 14.2 UT by N. Morrell, Las Campanas
Observatory, Carnegie Supernova Project; and Ismael Botti and Paula Lopez,
Universidad de Chile, reveals that 2010hv is a type-II supernova, showing a
blue continuum with the characteristic P-Cyg profiles in the Balmer lines and
strong galactic contamination.  A redshift of 7279 km/s (s.d. 13 km/s) is
derived from an average of ten emission lines from the underlying H II region,
superimposed on the supernova spectrum.  Considering that redshift, the
minimum of the H-beta absorption is blueshifted by 7400 km/s.  Interstellar
Na I absorption at the same redshift is observed with an E.W. of 0.08 nm.
Cross-correlation with a library of supernova spectra using the Supernova
Identification tool (Blondin and Tonry 2007, Ap.J. 666, 1024) suggests
that this supernova is of subtype II-p with ages ranging from 15 to 40 days.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 September 15                (CBET 2456)              Daniel W. E. Green