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SN 2013ds in PGC57429 - 1 luglio 2013

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SN2013ds (A.R., 16 11 29.58 Dec. +57 22 51.7), scoperta il 1 luglio 2013 nella galassia pgc 57429 (offset 15W 5S), magnitudine 18.0, tipo II.

SN scoperta da Ciabattari, Mazzoni, Rossi e Petroni con il telescopio Newton da 50cm dell'Osservatorio di Monte Agliale (Lucca).

Electronic Telegram No. 3577
Central Bureau for Astronomical Telegrams
CBAT Director:  Daniel W. E. Green; Hoffman Lab 209; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  <a
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http://www.cbat.eps.harvard.edu/index.html Prepared using the Tamkin Foundation Computer Network SUPERNOVA 2013ds IN PGC 57429 = PSN J16112958+5722517 F. Ciabattari, E. Mazzoni, and S. Donati, Borgo a Mozzano, Italy, report their discovery of an apparent supernova (mag 18.0) on unfiltered CCD images (limiting magnitude 19.5) obtained on July 1.92 and 2.85 UT with a 0.5-m<br> Newtonian reflector in the course of the Italian Supernovae Search Project.<br> The new object is located at R.A. = 16h11m29s.58, Decl. = +57d22'51" ;.7<br> (equinox 2000.0; astrometry with respect to USNO-B stars), which is 15" wes t<br> and 5" south of the center of the galaxy PGC 57429 = MCG +10-23-36. No thing<br> is visible at this position on digitized plates of the Palomar Sky Survey<br> from 1954 June 28 (E and O plates; limiting mag 20.1). The variable was<br> designated PSN J16112958+5722517 when it was posted at the Central Bureau 9;s<br> TOCP webpage and is here designated SN 2013ds based on the spectroscopic<br> confirmation reported below. Additional CCD magnitudes for 2013ds: 2013<br> June 14, [19.2 (Ciabattari); July 4.934, V = 17.9 (Massimiliano Martignoni,<br> Magnago, Italy; 0.25-m f/10 Schmidt-Cassegrain reflector; position end figures<b r> 29s.53, 51".6); 5.389, 17.4 (Joseph Brimacombe, Cairns, Australia; remotely <br> with a 51-cm telescope + luminance filter at the New Mexico Skies observatory<br > near Mayhill, NM, U.S.A.; position end figures 29s.58, 52".0; image posted at<br> website URL <a href="/http://www.flickr.com/photos/43846774@N02/9230355204/";>http ://http://www.flickr.com/photos/43846774@N02/9230355204/</a>); 6.896,<br> R = 17.3 (Xavier Bros, Ager, Spain; 0.35-m telescope; position end figures<br> 29s.55, 51".9; UCAC2 reference stars; image posted at the following website <br> URL: <a href="/http://www.anysllum.com/PSN_PGC57429.jpg";>http://www.anysllum.com /PSN_PGC57429.jpg</a>).<br> <br> L. Tomasella, S. Benetti, A. Pastorello, E. Cappellaro, P. Ochner, and M.<br> Turatto, report that optical spectroscopy (range 340-820 nm; resolution 1.3<br> nm), obtained on July 2.89 UT with the Asiago 1.82-m Copernico Telescope (+<br> AFOSC), shows that PSN J16112958+5722517 = SN 2013ds is a core-collapse<br> supernova. Assuming for the host galaxy a redshift of about 0.053 (which<br> agrees with the photometric redshift of 0.063 +/- 0.028 from the Sloan Digit al<br> Sky Survey DR9), a fair match is found with a spectrum of SN 1993J soon after<br > explosion. In general, the spectrum is consistent with those of early<br> type-II supernovae. For a detailed classification, one must wait for the<br> supernova's aging data. The Asiago classification spectra are posted at<br> website URL <a href="/http://sngroup.oapd.inaf.it;";>http://sngroup.oapd.inaf.it;< /a> classification was made via GELATO<br> (Harutyunyan et al. 2008, A.Ap. 488, 383) and SNID (Blondin and Tonry 2007,<br> Ap.J. 666, 1024).<br> <br> NOTE: These 'Central Bureau Electronic Telegrams' are sometimes<br> superseded by text appearing later in the printed IAU Circulars.<br> <br> (C) Copyright 2013 CBAT<br> 2013 July 10 (CBET 3577) Daniel W. E.