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PTF12os / PSN J14595904+0153251 is a Type IIb Supernova

ATel #3881; Iair Arcavi, Avishay Gal-Yam, Sagi Ben-Ami (Weizmann), Derek Fox (Penn State), Mansi Kasliwal (OCIW/Princeton), Peter Nugent (LBNL), D. Andrew Howell (UCSB/LCOGT), Jerod Parrent (Dartmouth/LCOGT), Assaf Horesh and Eric Bellm (Caltech) on behalf of the PTF collaboration.
on 24 Jan 2012; 23:02 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Avishay Gal-Yam (avishay.gal-yam@weizmann.ac.il)

Subjects: Optical, Supernovae

Referred to by ATel #: 3882, 3885

The PTF (ATEL #1964, #3253; http://www.astro.caltech.edu/ptf ) reports the discovery of a new supernova in NGC 5806 (independently discovered by F. Briganti and reported as PSN J14595904+0153251 on Jan 22). The source is located at RA = 14:59:59.08, Dec = +01:53:24.2 (J2000), was first detected by the Palomar 1.2m telescope with an R-band magnitude of about 17 on 2012 Jan 10 (UT) and brightened to about 16.1 mag on Jan 20. PTF did not detect the source prior to 2012 Jan 5. Spectroscopic follow-up was performed with the HET (+LRS) on Jan 14, the INT (+IDS) on Jan 15-18, Gemini N (+GMOS) on Jan 17 and the Palomar 5m (+DBSP) on Jan 18. The spectra show prominent H features as well as He absorption at about 10,000 km/s, consistent with a type IIb classification.