Supernova 2011id = Psn J02574049-5102281
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Date
2011
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Abstract
Report the discovery of an apparent supernova in unfiltered Siding Spring Survey (SSS) images: SN 2011 UT R.A. (2000.0) Decl. Mag. Offset 2011id Nov. 1.59 2 57 40.49 -51 02 28.1 18.2 6".9 E, 4".9 S The variable was designated PSN J02574049-5102281 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2011id based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2011id: Aug. 28.77 UT, [19.2 (SSS); Nov. 2.635, 18.0 (J. Brimacombe, Cairns, Australia; infrared filter, bandpass > 700 nm; position end figures 40s.51, 27".8; image posted at http://www.flickr.com/photos/43846774@N02/6306763959/). N. Sanders, D. Milisavljevic, and A. Soderberg, Harvard University, report that low-dispersion spectra (range 400-930 nm), obtained on Nov. 18.3 UT with the Magellan-Baade telescope (+ IMACS), show PSN J02574049-5102281 = SN 2011id to be 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 matches with normal type-Ia events between +20 and +40 days....