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PTF discovery of PTF10hcw, a type Ib supernova

ATel #2631; A. Gal-Yam, I. Arcavi, S. Ben Ami, D. Xu (Weizmann Institute of Science), M. M. Kasliwal, R. M. Quimby, E. O. Ofek, S. R. Kulkarni (Caltech), P. Nugent (LBNL), N. M. Law (U. Toronto), R. G. Dekany, G. Rahmer, David Hale, R. Smith, J. Zolkower, V. Velur, R. Walters, J. Henning, K. Bui, D. McKenna (Caltech), and J. Jacobsen (LBNL) on behalf of the Core-Collapse working group of the Palomar Transient Factory (ATEL#1964)
on 24 May 2010; 11:48 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Avishay Gal-Yam (avishay.gal-yam@weizmann.ac.il)

Subjects: Optical, Supernovae

The PTF (ATEL #1964; http://www.astro.caltech.edu/ptf/ ) reports the discovery of a new supernova, PTF10hcw. The supernova was discovered on May 14 UT at RA(J2000) = 08:43:36.22 and DEC(J2000) = +50:12:38.5 at a magnitude of 19.27 in R-band (calibrated with respect to the USNO catalog) in the galaxy NGC 2639. The supernova was not detected down to mag 20.3 in previous PTF images taken during April 2010 (3-sigma). A spectrum was obtained using the Low Resolution Imaging Spectrometer (LRIS; Oke et al. 1995, PASP, 107, 375) on the Keck I 10-m telescope on May 15 UT, revealing the supernova to be of type Ib. The superfit program (Howell et al. 2005, ApJ 634, 1190) finds a good match to the type Ib SN 1999dn at 2-3 weeks post-peak.