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Date and Time of the Query: 2018-11-21 T01:30:30 PST
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For refcode 2013CBET.3416A...1P:
Retrieve 2 NED objects in this reference.
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NED Abstract

Copyright by Central Bureau for Astronomical Telegrams. 2013CBET.3416A...1P Electronic Telegram No. 3416 Central Bureau for Astronomical Telegrams INTERNATIONAL ASTRONOMICAL UNION SUPERNOVA 2013aa in NGC 5643 = PSN J14323388-4413278 Stuart Parker, Canterbury, New Zealand, reports the discovery of an apparent supernova (red mag 11.9 ) on a 30-s unfiltered CCD image (limiting mag 19) taken by himself on Feb. 13.621 UT with a 30-cm Astro-Tech AT12RC Ritchey-Chretien astrograph (+ ST10 camera) at his Parkdale Observatory in the course of the Backyard Observatory Supernova Search. The new object is located at R.A. = 14h32m33s.88, Decl. = -44d13'27".8 (equinox 2000.0; reference stars from UCAC4 catalogues; measured by Colin Drescher, Calamvale, Queensland, Australia), which is 74" west and 180" south of the nucleus of the galaxy NGC 5643. Nothing is visible at this position on an unfiltered CCD image taken on Feb. 1.602 by Parker or on Digitized Sky Survey red and infrared images (limiting red magnitude > 19). Parker posted an image of the new object at website URL http://tinyurl.com/dx7tfrx. The variable was designated PSN J14323388-4413278 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2013aa based on the spectroscopic confirmation reported below. A. Amorim, Florianopolis, Brazil, reports the following visual magnitude estimates for 2013aa obtained with a 0.18-m reflector: Feb. 16.1243, 11.6; 16.2938, 11.5. J. T. Parrent, Las Cumbres Observatory Global Telescope (LCOGT) and Dartmouth College; D. Sand, Texas Tech University; and S. Valenti, M. L. Graham, and D. A. Howell, LCOGT and University of California at Santa Barbara, report spectroscopic observations of PSN J14323388-4413278 = SN 2013aa. A spectrogram (range 350-1000 nm) obtained robotically on Feb. 15.70 UT with the FLOYDS (FTS) spectrograph shows it to be a type-Ia supernova, a few days before maximum light. A second spectrogram (range 350-950 nm) was also acquired with the Gemini Multi-Object Spectrograph (GMOS) on the 8-m Gemini South telescope on Feb. 15.38, confirming the classification. After correcting for the recession velocity of its host-galaxy, NGC 5643 (1199 km/s; via NED), the minimum of the Si II 635.5-nm absorption feature is found to be blue-shifted by about 10960 km/s. Comparisons to other spectra with "Superfit" (Howell et al. 2005, Ap.J. 634, 1190) show similar overlap with SN 1996X near maximum light. By Feb. 15.38, there was no conspicuous signature of C II 657.8-nm; however, a small depression is seen on top of the Si II 635.5-nm emission component, at 634.7 nm, similar to that of SN 2011fe near maximum light (Pereira et al. 2013, pre-print, as posted at website URL http://xxx.lanl.gov/abs/astro-ph/?0008463). NOTE: These 'Central Bureau Electronic Telegrams' are sometimes superseded by text appearing later in the printed IAU Circulars. (C) Copyright 2013 CBAT 2013 February 16 (CBET 3416) Daniel W. E. Green
Retrieve 2 NED objects in this reference.
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