[IAUC] CBET 3768: 20131229 : SUPERNOVA 2013hq IN NGC 7276 = PSN J22241321+3605008

Dom Dic 29 16:48:38 ART 2013

                                                  Electronic Telegram No. 3768
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 2013hq IN NGC 7276 = PSN J22241321+3605008
     S. Nakano, Sumoto, Japan, reports the discovery by Koichi Itagaki
(Teppo-cho, Yamagata) of an apparent supernova (mag 17.1) on an unfiltered CCD
frame (limiting magnitude 18.5) taken on Dec. 13.384 UT using a 0.50-m f/6.8
reflector at the Takanezawa station, Tochigi-ken.  The new object is located
at R.A. = 22h24m13s.21, Decl. = +36d05'00".8 (equinox 2000.0), which is 14"
west and 14" south of the center of NGC 7276.  The discovery image was posted
at website URL http://www.k-itagaki.jp/images/7276.jpg.  The variable was
designated PSN J22241321+3605008 when it was posted at the Central Bureau's
TOCP webpage and is here designated SN 2013hq based on the spectroscopic
confirmation reported below.  Additional CCD magnitudes for 2013hq:  Nov.
28.480, [18.0 (Itagaki); Dec. 13.484, 17.2 (T. Noguchi, Katori, Chiba-ken,
Japan; 0.23-m f/6.3 Schmidt-Cassegrain reflector + BITRAN BT-11E camera;
limiting magnitude 18.5; position end figures 13s.18, 00".8; image posted at
website URL http://park8.wakwak.com/~ngc/images/PSNinNGC7276.jpg; communicated
by Nakano); 13.773, 16.3 (Gianluca Masi, Francesca Nocentini, and Patrick
Schmeer; remotely using a 43-cm telescope near Ceccano, Italy; position end
figures 13s.16, 00".8); 13.843, 16.6 (Massimiliano Martignoni, Magnago, Italy;
0.25-m f/10 Schmidt-Cassegrain reflector; position end figures 13s.15, 00".7;
PPMXL reference stars); 14.148, 16.4 (T. Yusa, Osaki, Japan; 0.25-m f/3.4
hyperbolic astrograph + SBIG ST-10XME camera at the RAS Observatory near
Mayhill, NM, U.S.A.; limiting mag 18.0; six stacked 120-s exposures; position
end figures 13s.21, 00".7; UCAC4 reference stars; image posted at website URL
http://space.geocities.jp/yusastar77/supernova/PSNinN7276_131214.htm); 15.824,
16.6 (Federica Luppi and Luca Buzzi, Varese, Italy; 0.60-m f/4.6 reflector;
position end figures 13s.19, 00".7; reference stars from CMC-14 catalogue;
image posted at URL http://www.astrogeo.va.it/pub/TOCP/PSN_N7276.jpg); 16.081,
16.9 (Joseph Brimacombe, Cairns, Australia; remotely using a 51-cm RCOS
telescope + STXL-6303 camera at the New Mexico Skies observatory near Mayhill;
position end figures 13s.21, 00".7); 17.060, 16.8 (Brimacombe; image posted at
website URL http://www.flickr.com/photos/43846774@N02/11532899014/; position
end figures 13s.21, 00".6).

     K. Ayani, Bisei Astronomical Observatory (BAO), Ibara, Okayama, Japan,
obtained a low-resolution spectrogram (range 400-800 nm; resolution 0.6 nm at
H-alpha) of PSN J22241321+3605008 = SN 2013hq with the BAO 1.01-m telescope on
Dec. 24.45 UT.  The spectrum is that of a type-Ia supernova several days after
maximum.  Cross-correlation with a library of supernova spectra using the
"SuperNova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666,
1024) shows that 2013hq matches with SN 1992A at seven days after maximum.
Assuming that the heliocentric velocity of NGC 7276 of 5980 km/s (Huchra et
al. 1999, Ap.J. Suppl. 121, 287), the blueshift of the Si II 635.5-nm
absorption is about 10000 km/s.


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

                         (C) Copyright 2013 CBAT
2013 December 29                 (CBET 3768)              Daniel W. E. Green