Spectroscopic Classification of PSN J10491665-1938253 as a Type IIP Supernova and KAIT Observations
ATel #7143; W. Zheng, M. L. Graham, A. Bigley, K. I. Clubb, and A. V. Filippenko, University of California, Berkeley
on 26 Feb 2015; 07:37 UT
Credential Certification: Weikang Zheng (email@example.com)
Subjects: Optical, Supernovae
A CCD spectrum (range 350-1000 nm) of PSN J10491665-1938253 was obtained on Feb. 25.4 UT with the Shane 3-m reflector (+ Kast spectrograph) at Lick Observatory. The spectrum shows that PSN
J10491665-1938253 is a young type-IIP supernova. Cross-correlation with a library of supernova spectra using the "SuperNova Identification" code (SNID; Blondin and Tonry 2007, Ap.J. 666, 1024) indicates a similarity with several type-IIP supernovae including SN 2005cs and SN 2004et roughly a few days after explosion. The redshift estimated from SNID is z = 0.015, in good agreement with the value given in SIMBAD for the host galaxy, ESO 569-G12 (z = 0.014).
PSN J10491665-1938253, which was discovered by Koichi Itagaki on Feb. 20.628 UT, was also independently discovered by the 0.76-m Katzman Automatic Imaging Telescope (KAIT) at Lick Observatory on Feb. 24.345 UT. KAIT autonomously began a sequence of triggered follow-up observations in the B, V, R, I, and clear (roughly R) filters beginning only 5 minutes after discovery. Using stars from the USNO-B1 catalog for reference, we measure R = 17.1 mag. Previous KAIT imaging on 2015 Feb. 16.6 UT, about 4 days before Itagaki's discovery, revealed no emission at this location to a limit of R ~ 18.2 mag. A finding chart is posted at the following website: http://astro.berkeley.edu/~zwk/findingchart/PSN_J10491665-1938253.jpg