[IAUC] CBET 2973: 20120111 : SUPERNOVA 2011jq NEAR MCG +01-14-15 = PSN J05164155+0629302

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                                                  Electronic Telegram No. 2973
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)
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Prepared using the Tamkin Foundation Computer Network


SUPERNOVA 2011jq NEAR MCG +01-14-15 = PSN J05164155+0629302
     [Editor's note:  An unknown glitch evidently prevented this text
from being issued as CBET 2966 on 2011 Dec. 31, so it is being re-issued
here with a new CBET number.]
     F. Ciabattari and E. Mazzoni, Borgo a Mozzano, Italy, report their
discovery of an apparent supernova (mag 18.4) on unfiltered CCD images
(limiting magnitude = 19.5) obtained on Dec. 27.89 and 29.04 UT with a 0.5-m
Newtonian telescope in the course of the Italian Supernovae Search Project.
The new object is located at R.A. = 5h16m41s.55, Decl. = +06d29'30".2
(equinox 2000.0; astrometry with respect to UCAC-2 stars) which is 7" south of
the center of the galaxy MCG +01-14-15 = PGC 17024.  Nothing is visible in
their images from October to limiting mag 19.0.  The variable was designated
PSN J05164155+0629302 when it was posted at the Central Bureau's TOCP webpage
and is here designated SN 2011jq based on the spectroscopic confirmation
reported below.  Additional magnitudes for 2011jq, from Ciabattari unless
noted otherwise:  1990 Oct. 25, [20.3 (Palomar Sky Survey, F plate); 1993 Jan.
23, [20.3 (Palomar Sky Survey, J plate); 2011 Dec. 29.207, 19.3 (Joseph
Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS telescope + STL11K
camera + luminance filter at the New Mexico Skies Observatory near Mayhill,
NM, U.S.A.; position end figures 41s.55, 29".1; image posted at website URL
http://www.flickr.com/photos/43846774@N02/6596104823/).

     G. H. Marion, Harvard-Smithsonian Center for Astrophysics (CfA), on
behalf of the CfA Supernova Group, report that a spectrum (range 340-740 nm)
of PSN J05164155+0629302 = 2011jq was obtained on Dec. 30 UT by P. Berlind
with the F. L. Whipple Observatory 1.5-m telescope (+ FAST).  Cross-
correlation with a library of supernova spectra using the "Supernova
Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows
that the object is a type-Ia supernova before maximum light.  A good fit is
found to the template of the 1991bg-like supernova 2005mz at 7 days before
maximum.  The velocities of Si II at 635.5 and 597.2 nm are 11200 and 10800
km/s, respectively, assuming a redshift of z = 0.034 that was measured from
the host-galaxy emission lines.  Note that this redshift differs from the
value of z = 0.024 listed by NED for the proposed host galaxy, MCG +01-14-15.
The R(Si II) line-depth ratio (Nugent et al. 1995, Ap.J. 455, L147) is about
0.48, which is consistent with 1991bg-like type-Ia supernovae.  The most
recently reported brightness (magnitude 19.3 on Dec. 29, via postings at the
TOCP) is about three magnitudes below the expected brightness for a normal
type-Ia supernova at maximum.


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

                         (C) Copyright 2012 CBAT
2012 January 11                  (CBET 2973)              Daniel W. E. Green