Supernova 2012cr in NGC 4626 = Psn J12422445-0702576
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Date
2012
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Abstract
Report the discovery of an apparent supernova in public images from the Catalina Sky Survey (CSS). SN 2012 UT R.A. (2000.0) Decl. Mag. Offset 2012cr May 25.15 12 42 24.45 - 7 02 57.6 18.3 12".7 W, 18".2 S The variable was designated PSN J12422445-0702576 when it was posted at the Central Bureau's TOCP webpage and is here designated SN 2012cr based on the spectroscopic confirmation reported below. Additional CCD magnitudes for 2012cr: Mar. 30.33 UT, [19.5 (CSS); May 25.920, 17.5 (Giancarlo Cortini, Predappio, Italy; Celestron C14 reflector + SXVR-H9 camera); 27.258, 17.5 (Joseph Brimacombe, Cairns, Australia; luminance filter; position end figures 24s.52, 57".6). Brimacombe's image is posted at the following website URL: http://www.flickr.com/photos/43846774@N02/7290971272/. Y. Cao, California Institute of Technology; M. M. Kasliwal, Carnegie Institute for Science and Princeton University; and C. J. White, Princeton University, report spectroscopic follow-up of PSN J12422445-0702576 = 2012cr on May 30.14 UT with the Dual Imaging Spectrograph mounted on the ARC 3.5-m telescope at the Apache Point Observatory. Broad H_alpha emission resembles that seen in normal type-II supernovae at about several days after maximum brightness. The H_alpha has a FWHM of about 18000 km/s. Narrow H_alpha, nitrogen, and sulfur lines suggest a redshift of about 0.009, consistent with the redshift of its host galaxy, NGC 4626.