[IAUC] CBET 2911: 20111122 : SUPERNOVA 2011ib IN UGC 6716

Mar Nov 22 12:27:31 ART 2011

                                                  Electronic Telegram No. 2911
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 2011ib IN UGC 6716
     Vladimir Lipunov and V. Shumkov, on behalf of the MASTER team, report
the discovery of an apparent supernova (mag 16.8) on ten unfiltered CCD images
(limiting mag 19.3) taken with the MASTER-Net auto-detection system (cf.
website URL http://observ.pereplet.ru) at Kislovodsk on Nov. 15.08 UT.  The
new object is located at R.A. = 11h44m39s.27, Decl. = +35d58'03".9 (equinox
2000.0), which is 27".9 west and 0".7 south of the center of the galaxy UGC
6716.  Nothing was visible at this position on a MASTER-Kislovodsk reference
image from 2010 Nov. 18.07 (limiting unfiltered mag 19.8).  The discovery image
is posted at the following website URL:
http://observ.pereplet.ru/images/SN114439.27+355803.9/SN114439.27+355803.9.png.

     S. Valenti, A. Pastorello, S. Benetti, L. Tomasella, F. Bufano, and P.
Ochner, Istituto Nazionale di Astrofisica, Osservatorio Astronomico di Padova,
on behalf of a larger collaboration, report that a spectrogram of 2011ib,
obtained on Nov. 20.16 UT with the 1.82-m Copernico Telescope (+ AFOSC; range
340-790 nm, resolution 2.2 nm), indicates that it is a peculiar type-IIn
supernova.  The best fit to this spectrum found using a library of supernova
spectra via GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383; available at URL
https://gelato.tng.iac.es/login.cgi) suggests that 2011ib is similar to
SN 1998S at a phase of about 2 months after maximum.


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      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2011 CBAT
2011 November 22                 (CBET 2911)              Daniel W. E. Green