[IAUC] CBET 2849: 20111001 : SUPERNOVA 2011go IN MCG +07-15-2 = PSN J06555100+4041466

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                                                  Electronic Telegram No. 2849
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 2011go IN MCG +07-15-2 = PSN J06555100+4041466
     T. Boles, Coddenham, England, reports the discovery of an apparent
supernova (mag 18.1) on an unfiltered CCD image taken on Sept. 30.146 UT with
a 0.35-m reflector.  The new object is located at R.A. = 6h55m51s.00, Decl. =
+40o41'46".6 (equinox 2000.0), which is approximately 2".3 east and 7".5 north
of the center of MCG +7-15-2 = PGC 19876.  The variable was designated as PSN
J06555100+4041466 when it was posted on the Central Bureau's TOCP webpage and
is here designated SN 2011go based on the spectroscopic confirmation reported
below.  Additional magnitudes for 2011go (obtained via unfiltered CCD unless
noted otherwise):  1989 Nov. 9, [20.5 (Digitized Sky Survey red plate; via
Boles); 1994 Jan. 9, [21.0 (Digitized Sky Survey blue plate; via Boles); 2010
Dec. 11, [19.5 (Boles); 2011 Mar. 18, [19.5 (Boles); Sept. 30.482, 18.5 (R. A.
Koff, Bennett, CO, USA; Meade 0.25-m f/10 Schmidt-Cassegrain reflector +
Apogee AP-47p camera; limiting magnitude 19.4; image scale 2"/pixel; position
end figures 51s.03, 45".8; UCAC3 reference stars); 30.581, R = 18.4 (P.
Miller, P. Roche, A. Tripp, R. Miles, R. Holmes, S. Foglia, and L. Buzzi;
2.0-m f/10 Faulkes Telescope North + Bessell R filter at Haleakala; position
end figures 51s.00, 46".9).  Foglia has posted their image at website URL
http://www.astrogeo.va.it/pub/TOCP/PSN_P19876_FTN.jpg.

     S. Valenti, E. Cappellaro, S. Benetti, Osservatorio Astronomico di
Padova, Istituto Nazionale di Astrofisica (INAF); M. Turatto, Osservatorio
Astronomico di Trieste, INAF; and A. Pastorello, Dipartimento di Astronomia,
Universita di Padova, on behalf of a larger collaboration, report that a
spectrogram (range 360-810 nm; resolution 2.2 nm) of PSN J06555100+4041466 =
SN 2011go, obtained on Oct. 1.01 UT with the Ekar-Copernico 1.82-m telescope
(+ AFOSC), shows that is a type-II supernova with strong H_alpha emission
showing a broad and narrow component.  Cross-correlation with a library of
supernova spectra via the "GELATO" code (Harutyunyan et al. 2008, A.Ap. 488,
383; available at URL https://gelato.tng.iac.es/login.cgi), shows resemblance
to that of SN 2006gy (Agnoletto et al. 2009, Ap.J. 691, 1348), but because
of the slow evolution, the phase cannot be constrained.


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

                         (C) Copyright 2011 CBAT
2011 October 1                   (CBET 2849)              Daniel W. E. Green