[IAUC] CBET 4128: 20150801 : SUPERNOVA 2015Q IN NGC 3888 = PSN J11473508+5558147

Sab Ago 1 01:40:53 ART 2015

                                                  Electronic Telegram No. 4128
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 2015Q IN NGC 3888 = PSN J11473508+5558147
     P. Wiggins, Tooele, UT, USA, reports his discovery of an apparent
supernova (mag about 16.0) on an unfiltered CCD frame taken June 17.299 UT
using a 0.35-m f/5.5 reflector near Erda, Utah.  The new object is located at
R.A. = 11h47m35s.08, Decl. = +55d58'14".7 (equinox 2000.0), just north of the
center of NGC 3888.  Wiggins notes that nothing was visible at this position
on an image taken on June 14 (no limiting magnitude provided).  The discovery
image was posted at URL http://www.slas.us/gallery2/main.php?g2_itemId=6246.
The variable was designated PSN J11473508+5558147 when it was posted at the
Central Bureau's TOCP webpage and is here designated SN 2015Q based on the
spectroscopic confirmation reported below.  Additional CCD magnitudes for
2015Q:  June 18.898, 16.3 (G. Masi; remotely using a 43-cm telescope at
Ceccano, Italy; position end figures 35s.08, 14".7); 19.235, 17.4 (J.
Brimacombe, Cairns, Australia; position end figures 35s.22, 15".2; image
posted at URL https://www.flickr.com/photos/43846774@N02/18981738816/);
19.905, 16.3 (R. Belligoli, F. Castellani, and C. Marangoni, Verona, Italy;
Ritchey-Chretien 0.4-m reflector; position end figures 35s.06, 15".3; offset
5".6 east, 12".9 north; image posted via URL http://tinyurl.com/nnj3nnf).

     D. C. Leonard, San Diego State University; P. Sheehan and D. McCarthy,
University of Arizona; K. Follette, Stanford University; J. Moustakas, Siena
College; and D. Cantillo, A. Cazares-Kelly, S. Cazares-Kelly, Y. Cendes, N.
Damm, A. Donati, E. Douglas, L. Ferrell, H. Fosbiner-Elkins, C. Fox, M.
Greenberg, K. Hart, H. Hensley, A. Holt, E. Hooper, C. Juran, J. Keane, K.
Key, L. Korus, T. Lee, K. Leidig, E. Merchak, K. Nessmann, S. Pendyala, S.
Pirkl, J. Reeder, A. Roos, S. Rounseville, E. Ruddy, A. Schlingman, W.
Schlingman, W. M. Schlingman, E. Schwartzman, V. Shanmugam, E. Silver, A.
Stein, N. Stock, B. Svoboda, B. Thomas, N. Thomas, K. Thompson-Taylor, and H.
Walton, 2015 Advanced Teen Astronomy Camp, report on optical spectroscopy of
PSN J11473508+5558147 = SN 2015Q through inspection of a low-dispersion
optical spectrogram (range 370-680 nm; resolution 0.8 nm) obtained with the
2.3-m Bok telescope (+ Boller & Chivens spectrograph) at Kitt Peak on June 21
UT.  PSN J11473508+5558147 = SN 2015Q is a type-Ib supernova; cross-
correlation with a library of supernova spectra using the comparison tool
GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) finds good matches with
near-maximum type-Ib supernovae at a redshift of 0.008, consistent with the
NED redshift of the putative host galaxy, NGC 3888 (de Vaucouleurs et al.
1991, RC3 catalogue).


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

                         (C) Copyright 2015 CBAT
2015 August 1                    (CBET 4128)              Daniel W. E. Green