2010CBET.2488....1G

A. Gal-Yam, Weizmann Institute of Science; D. A. Howell, University of California at Santa Barbara and Las Campanas Observatory; S. B. Cenko and J. S. Bloom, University of California at Berkeley; M. M. Kasliwal and S. R. Kulkarni, California Institute of Technology (CIT); N. M. Law, University of Toronto; and E. O. Ofek and R. M. Quimby, CIT, report the independent discovery of SN 2010ib (cf. CBET 2464) by the "Palomar Transient Factory" (PTF) group. The supernova (referred to by the PTF group as PTF10qob) was initially detected at R-band magnitude 19.1 via the Palomar 1.2-m Oschin Schmidt telescope on Aug. 4.38 UT, though no object is visible at the position of 2010ib on an image obtained on July 24.47 (limiting magnitude 20.1).

CCD spectra (range 350-900 nm) of 2010ib were obtained on Aug. 6 UT with the Gemini Multi-Object Spectrograph mounted on the 8-m Gemini South telescope. Matches to template spectra using "Superfit" indicate that 2010ib is a type-II supernova with strong P-Cyg profiles clearly visible in the Balmer series. Using superimposed narrow emission lines, a redshift of z = 0.0187 was measured for the presumed host galaxy, consistent with archival (NED) values for the nearby Minkowski object.