SIMBAD references

R. Chornock, G. H. Marion, and M. Calkins, Harvard-Smithsonian Center for Astrophysics (CfA); R. Kotak, L. Magill, S. J. Smartt, K. Smith, and M. Fraser, Queen's University, Belfast; C. Leibler, R. J. Foley, E. Berger, R. P. Kirshner, G. Narayan, A. M. Soderberg, and C. Stubbs, CfA; A. Rest, Space Telescope Science Institute; M. Huber and J. Tonry, Institute for Astronomy (IfA), University of Hawaii; A. Riess, Johns Hopkins University; W. M. Wood- Vasey, University of Pittsburgh; E. Magnier, K. Chambers, N. Kaiser, J. Morgan, W. Burgett, J. Heasley, W. Sweeney, C. Waters, and H. Flewelling (IfA); and P. A. Price, Princeton University, report the early discovery and spectroscopic confirmation of a low-redshift type-Ia supernova (preliminary designation PS1-12rg) in the galaxy UGC 7228 (cz = 7568 km/s; Falco et al. 1999, PASP 111, 438) by the Pan-STARRS1 Medium Deep Survey. The object was first detected on Mar. 11.50 UT at R.A. = 12:13:37.309, Decl. = +46:29:00.48 (equinox 2000.0) with an approximate magnitude of z_P1 = 22.8 (AB); it rose to mag i_P1 = 16.99 by Mar. 21.47. A spectrum (range 480-940 nm), obtained on Mar. 15 using the Gran Telescopio Canarias (+ OSIRIS + R300R grism), shows 2012bh to be a young, normal type-Ia supernova. An additional spectrum (range 350-740 nm) was obtained on Mar. 23 with the 1.5-m telescope at the Fred L. Whipple Observatory on Mount Hopkins. Cross-correlation of the Mar. 23 spectrum with a library of supernova spectral templates using the SNID code of Blondin and Tonry (2007, Ap.J. 666, 1024) gives a best-fit age of about a week before maximum light. The velocity of the absorption minimum of Si II 635.5-nm is 10800 km/s. This discovery was made possible by the PS1 system operated by the PS1 Science Consortium and its member institutions (see URL http://www.ps1sc.org/PS1_System_IAU.shtml). The authors thank the telescope operators of the PS1, GTC, and FLWO telescopes for their support.