[IAUC] CBET 2916: 20111123 : SUPERNOVA 2011if = PSN J10061104+2509015

Mar Nov 22 22:48:10 ART 2011

                                                  Electronic Telegram No. 2916
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 2011if = PSN J10061104+2509015
     T. Kryachko, S. Korotkiy, and B. Satovskiy, Astrotel Observatory, Kazan
State University, report the discovery of an apparent supernova (mag
approximately 18.5) on five unfiltered CCD images (limiting mag 21.0) obtained
on Oct. 31.07 UT with a 30-cm Takahashi FRC-300 telescope (+ Apogee Alta U9000
camera) at Karachay-Cherkessia, Russia.  The new object is located at R.A. =
10h06m11s.04 +/- 0".1, Decl. = +25d09'01".5 +/- 0".1 (equinox 2000.0), which
is about 1".5 west and 3".3 north of the center of the galaxy PGC 1726998
(whose position end figures are 11s.19, 08'58".2).  Nothing is visible at this
position on the Sloan Digital Sky Survey.  The discovery image is posted at
website URL http://www.astroalert.su/files/psn_j10061104_2509015_.png.  The
variable was designated PSN J10061104+2509015 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2011if based on the
spectroscopic confirmation reported below.  Additional magnitudes for 2011if:
1991 Apr. 6, [21.0 (Palomar Sky Survey, red plate, via the Digitized Sky
Survey; via Kryachko et al.); 2011 Nov. 16.476, 19.4 (Joseph Brimacombe,
Cairns, Australia; position end figures 11s.02, 01".5; image posted at
website URL http://www.flickr.com/photos/43846774@N02/6351538760/).

     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 low-signal-to-noise
spectrogram of PSN J10061104+2509015 = SN 2011if, obtained on Nov. 21.12 UT
with the 1.82-m Copernico Telescope (+ AFOSC; range 340-790 nm, resolution 2.2
nm), suggests that 2011if is a type-II 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 https://gelato.tng.iac.es/login.cgi),
indicates that 2011if is similar to SN 1980K at a phase of a few weeks 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 23                 (CBET 2916)              Daniel W. E. Green