[IAUC] CBET 2988: 20120121 : SUPERNOVA 2011jy

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                                                  Electronic Telegram No. 2988
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 en eps.harvard.edu (alternate cbat en iau.org)
URL http://www.cbat.eps.harvard.edu/index.html
Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2011jy
     Vladimir Lipunov, Sternberg Astronomical Institute, on behalf of the
MASTER Robotic Net team, reports the discovery of an apparent supernova (mag
V = 16.5 +/- 0.3) via the MASTER-Amur auto-detection system on two images
(limiting mag 17.9) taken on 2011 Dec. 30.792 UT.  The new object is located
at R.A. = 10h53m57s.03, Decl. = +23d22'34".5 (equinox 2000.0); while a faint
galaxy of red mag 20 is seen on Sloan Digital Sky Survey images, it is not
present on the MASTER images (given the SDSS position for the galaxy, the
variable would be about 0".8 southwest of the galaxy center).  Nothing is
visible at this position on a MASTER reference image from 2011 Nov. 22.894
(limiting V magnitude 18.1).  The discovery image has been posted at URL
http://observ.pereplet.ru/images/105357.03+232234.5/105357.03+232234.5.png.

     L. Tomasella, E. Cappellaro, P. Ochner, S. Benetti, A. Pastorello, and
S. Valenti, Osservatorio Astronomico di Padova, Istituto Nazionale di
Astrofisica, report that a spectrum (range 360-810 nm; resolution 2.2 nm) of
2011jy was obtained on Jan. 17.92 UT with the Ekar-Copernico 1.82-m telescope
(+ AFOSC).  The spectrum is dominated by broad Balmer emissions.  Using a
library of supernova spectra via GELATO (Harutyunyan et al. 2008, A.Ap. 488,
383; available via https://gelato.tng.iac.es/login.cgi), they found a best
match with typical type-II supernovae at 1-2 weeks after maximum at a redshift
z = 0.04.


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                         (C) Copyright 2012 CBAT
2012 January 21                  (CBET 2988)              Daniel W. E. Green