NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-22 T18:28:48 PDT
Help | Comment | NED Home

For refcode 2013CBET.3375A...1N:
Retrieve 2 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by Central Bureau for Astronomical Telegrams. 2013CBET.3375A...1N Electronic Telegram No. 3375 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION Nakano, S.; Yusa, T.; Kadota, K.; Ayani, K.; Takaki, K.; Itoh, R.; Ueno, I.; Moritani, Y.; Akitaya, H.; Kawabata, K. S.; Yamanaka, M.; Marion, G. H.; Challis, P.; Berlind, P. SUPERNOVA 2013C in PGC 33561 = PSN J11055522+7231203 S. Nakano, Sumoto, Japan, reports the discovery by Masaki Tsuboi (Kuchita-minami, Asakita-ku, Hiroshima) of an apparent supernova (mag 16.5) on a 40-s unfiltered CCD frame (limiting mag 18.4) taken on Jan. 4.776 UT using a 0.30-m f/5.3 reflector (+ ST-9XE camera) and confirmed on 35 frames taken during about one hour after the discovery image. The new object is located at R.A. = 11h05m55s.22, Decl. = +72d31'20".3 (equinox 2000.0), which is 5".1 west and 11".4 south of the center of the galaxy PGC 33561. Nothing is visible at this position on a Digitized Sky Survey image (limiting red mag 19 or fainter). Tsuboi has posted his discovery image at the following URL: http://tenku.dee.cc/PSN/P33561130105-11.jpg. The variable was designated PSN J11055522+7231203 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2013C based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2013C (unfiltered unless otherwise noted): 2012 Nov. 3.752, [17.6 (Tsuboi); 2013 Jan. 4.955, 16.0 (Giancarlo Cortini, Predappio, Italy; 0.35-m reflector; limiting mag 19.5); 5.014, 15.9 (T. Yusa, Osaki, Japan; remotely using the iTelescope T18, a 0.32-m f/8.0 astrograph, at the RAS observatory near Nerpio, Spain; position end figures 55s.21, 20".1; UCAC-3 reference stars; limiting mag 19.0; images posted at URL http://space.geocities.jp/yusastar77/supernova/PSNinP33561_130105.htm); 5.087, R_c = 16.7 (Massimiliano Martignoni, Magnago, Italy; 0.25-m reflector; position end figures 55s.25, 20".7); 5.589, 16.2 (Toshihide Noguchi, Katori, Chiba-ken, Japan; 0.23-m f/6.3 reflector + BITRAN BT-11E camera; limiting mag 18.0; position end figures 55s.31, 20".1; position end figures of galaxy center 56s.44, 31".3; UCAC3 reference stars; communicated by Nakano; image posted at website URL http://park8.wakwak.com/~ngc/images/PSNinP33561.jpg); 5.681, 16.1 (K. Kadota, Ageo, Saitama-ken, Japan; 0.25-m reflector + SBIG ST-9E camera; position end figures 55s.24, 20".6; galaxy center position end figures 56s.20, 32".8; limiting mag 19.2; communicated by Nakano; image posted at http://members.jcom.home.ne.jp/kenic-k/image/PSNinPGC33561-20130105.jpg). K. Ayani, Bisei Astronomical Observatory (BAO), Ibara, Okayama, Japan, obtained a low-resolution spectrum (range 400-800 nm, resolution 0.6 nm at H_{alpha}) of PSN J11055522+7231203 = SN 2013C with the BAO 1.01-m telescope on Jan. 5.6 UT. The spectrum is that of a type-Ia supernova around maximum. The absorption minimum of Si II 635.5-nm feature is blueshifted by about 12700 km/s, assuming the resession velocity of PGC 33561 to be 7182 km/s (Emilio et al. 1999, PASP 111, 438). K. Takaki, R. Itoh, I. Ueno, Y. Moritani, H. Akitaya, and K. S. Kawabata, Hiroshima University; and M. Yamanaka, Kyoto University, obtained a low-resolution optical spectrogram (range 480-900 nm) of PSN J11055522+7231203 = SN 2013C on Jan. 5.5 UT with the 1.5-m Kanata telescope (+ HOWPol) at the Higashi-Hiroshima Observatory. The spectrum exhibits prominent absorption lines at 495, 565, 623, and 833 nm; they are identified as an Fe II multiplet, S II 545.4- and 564.0-nm, Si II 635.5-nm, and the Ca II infrared triplet, respectively. A comparison with a library of supernova spectra using GELATO (Harutyunyan et al. 2008, A.Ap. 488, 383) suggests that the spectrum is consistent with that of the type-Ia supernova 2002bo at four days before its B-band maximum. G. H. Marion and P. Challis, Harvard-Smithsonian Center for Astrophysics (CfA), on behalf of the CfA Supernova Group, report that a spectrogram (range 340-740 nm) of PSN J11055522+7231203 = SN 2013C was obtained on Jan. 5 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 2013C is a type-Ia supernova about one week before maximum light. A good fit is found to the template of the normal type-Ia supernova 2002er at seven days before maximum. The velocity of the Si II 635.5-nm absorption feature is measured to be approximately 12900 km/s, using a redshift of z = 0.023957 for PGC 33561 (Falco et al. 1999, PASP 111, 438; via NED). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2013 CBAT 2013 January 7 (CBET 3375) Daniel W. E. Green
Retrieve 2 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home