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Discovery of a young Ia supernova in NGC 890

ATel #5580; Y. Cao (Caltech), E. Y. Hsiao, M. M. Phillips, N. Morrell (LCO), T. Diamond (FSU), O. Yaron (Weizmann), M. M. Kasliwal (OCIW), P. E. Nugent (LBL), A. Goobar (OKC) On behalf of the intermediate Palomar Transient Factory
on 14 Nov 2013; 08:29 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Yi Cao (ycao@astro.caltech.edu)

Subjects: Optical, Supernovae

Referred to by ATel #: 5584, 5926

The intermediate Palomar Transient Factory (ATel #4807) reports discovery of a young Ia, iPTF13ebh, in the nearby galaxy NGC 890 (distance 35-52.3 Mpc; Theureau et al. 2007, A&A, 465, 71). The supernova was discovered at R.A.=02:21:59.98, Dec.=+33:16:13.7 (J2000) with r=18.9+/-0.1 mag on Nov 13.145 UT. It also appeared at r=21.0+/-0.2 mag in the co-added image from the night before (Nov 12 UT). Nothing was at the same location in the co-added image taken on Nov 11 UT with a limiting magnitude of r=21.7 mag. All photometry is in the PTF magnitude system (Ofek et al. 2012, PASP, 124, 854).

We obtained its near-infrared spectrum (range 800-2400 nm) with the Folded-port InfraRed Echellette (FIRE) spectrograph on the 6.5-m Magellan Baade Telescope at Las Campanas Observatory on Nov 14.136 UT. The spectrum is similar to SN2004bw at -9 days (Marion et al. 2009, AJ, 138, 727), but the velocity is much higher (~20,000 km/s). Therefore, we classify it as a young Type Ia supernova.

Further photometry and spectroscopy follow-up is strongly encouraged.