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Date and Time of the Query: 2019-05-20 T08:41:38 PDT
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For refcode 2013CBET.3662A...1H:
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NED Abstract

Copyright by Central Bureau for Astronomical Telegrams. 2013CBET.3662A...1H Electronic Telegram No. 3662 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION SUPERNOVA 2013fn IN IC 1342 = PSN J21002376-1429522 S. Howerton, Arkansas City, KS, U.S.A.; A. J. Drake, S. G. Djorgovski, A. Mahabal, M. J. Graham, and R. Williams, California Institute of Technology; J. L. Prieto, Princeton University; M. Catelan, Pontificia Universidad Catolica de Chile; and E. Christensen and S. M. Larson, Lunar and Planetary Laboratory, University of Arizona; report the Catalina Real-time Transient Survey discovery of an apparent supernova in public images from the Mount Lemmon Survey (MLS). SN 2013 UT R.A. (2000.0) Decl. Mag. Offset 2013fn Sep. 23.11 21 00 23.76 -14 29 52.2 18.5 25".9 W, 7".1 S The variable was designated PSN J21002376-1429522 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2013fn based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2013fn: Sept. 6.23, [21.0 (MLS); 26.217, 17.3 (L. Elenin, Lyubertsy, Russia; and I. Molotov, Moscow, Russia; remotely with a 0.4-m f/3 telescope at the ISON-NM Observatory near Mayhill, NM, USA; position end figures 23s.69 +/- 0".09, 51".7 +/- 0".12; UCAC-4 reference stars; limiting mag about 21.1; image posted at http://spaceobs.org/images/TOCP/PSNJ21002376-1429522-20130926.png). Jun Mo, Xulin Zhao, and Xiaofeng Wang, Tsinghua University; and Tianmeng Zhang, National Astronomical Observatories of China (NAOC), report on an optical spectrogram (range 390-870 nm) of PSN J21002376-1429522 = SN 2013fn that was obtained on Sept. 25.54 UT with the 2.16-m telescope (+ OMR) at the Xinglong Station of the NAOC. The spectrum is consistent with that of a young type-Ia supernova at about 10 days before maximum light. Cross- correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows that 2013fn matches with SN 1994D at -10 days. Adopting a redshift of 0.027 for the host galaxy, IC 1342 (from Theureau et al. 2005, A.Ap. 430, 373), they measure the velocity of the Si II 635.5-nm absorption feature to be about 16500 km/s. D. Milisavljevic, Harvard-Smithsonian Center for Astrophysics, reports that a low-dispersion spectrogram (range 425-940 nm), obtained on Sept. 29.15 UT with the 6.5-m Magellan-Baade telescope (+ IMACS), shows that PSN J21002376-1429522 = SN 2013fn is a type-Ia supernova. Cross-correlation with a library of supernova spectra using the "Supernova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) shows many reasonable matches with normal type-Ia events at approximately one week before maximum light. Among the best matches is SN 1997do at eight days pre-maximum. After removal of the host-galaxy redshift of z = 0.0270 for IC 1342 (Theureau et al. 2005, A.Ap. 430, 373), the absorption minimum of the Si II 635.5-nm line is found to be blueshifted by approximately 14200 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 October 1 (CBET 3662) Daniel W. E. Green
Retrieve 2 NED objects in this reference.
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