Electronic Telegram No. 2615
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 2010ls
     J. Maza, M. Hamuy, R. Antezana, L. Gonzalez, R. Cartier, F. Forster, S.
Silva, and F. Carrasco, Universidad de Chile; G. Pignata and M. Cifuentes,
Universidad Andres Bello; P. Gonzalez, Pontificia Universidad Catolica de
Chile; B. Conuel, Wesleyan University; G. Folatelli, IPMU, University of Tokyo;
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
16.2) on an unfiltered image taken on 2010 Dec. 29.30 UT with the 0.41-m
'PROMPT 4' telescope located at Cerro Tololo.  The new object, which is also
present at mag approximately 16.1 in an image taken on 2010 Dec. 30.28, is
located at R.A. = 13h40m51s.56 +/- 0".2, Decl. = -48o23'03".1 +/- 0".2
(equinox 2000.0).  Nothing is visible at this position on archival images
taken on 2010 May 12.29 and July 3.18 (limiting mag 18.0).

     M. Miluzio, S. Benetti, and F. Bufano, Istituto Nazionale di Astrofisica,
Osservatorio Astronomico di Padova; A. Pastorello, Queen's University, Belfast;
and G. Pignata, Universidad Andres Bello, on behalf of a larger collaboration,
report on spectroscopic observations (range 340-800 nm) of 2010ls obtained on
2010 Dec. 31.32 UT with the EFOSC2 spectrograph mounted on the New Technology
Telescope at the European Southern Observatory.  The spectrum of 2010ls is
that an evolved type-IIb supernova; from a comparison with a library of
supernova spectra performed with the "GELATO" code (Harutyunyan et al. 2008,
A.Ap. 488, 383; available at https://gelato.tng.iac.es/login.cgi), 2010ls is
found to be most similar to SN 1993J at about two months after maximum light.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 January 1                   (CBET 2615)              Daniel W. E. Green