Spectral Classifications of Gaia16akb and PS16bkm
ATel #8916; A. S. Piascik, I. A. Steele (Liverpool JMU)
on 6 Apr 2016; 14:57 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Iain Steele (iainsteele@mac.com)
Subjects: Optical, Supernovae
We conducted a spectroscopic observation of transient Gaia16akb at 2016-04-05T21:00:09 UT. This transient was observed by the Gaia Photometric Science survey at 2016-04-03T13:41:44 UT and position RA=09:18:58.5 DEC=35:54:41.3.
Classification using SNID (Blondin and Tonry 2007, ApJ, 666, 1024) indicates it is a type Ia supernova. We find a close match with SN2008ar at +1 day past maximum with at SNID estimated redshift of z=0.084. The transient is 0.047 arcmin from the proposed host galaxy, SDSS J091858.70+355439.9 (no redshift available). Assuming the SNID value of z=0.084, the ejecta velocity estimated from
the Si II 635.3nm absorption feature is ~11,800 km/s.
We also conducted a spectroscopic observation of transient PS16bkm (AT2016bkj Gaia16akf) at 2016-04-06T05:18:29 UT. This transient was reported in ATel #8857 by the Pan-STARRS Survey for Transients (PSST) at position RA=15:59:38.95 DEC=19:05:05.00
Classification using SNID indicates it is a type Ib supernova. We find a reasonable match with SN2002ji at +22 days with at SNID
estimated redshift of z=0.030 The redshift of the proposed host galaxy, SDSS J155938.96+190504.9, is z=0.032 (NED).
Both spectra were obtained in the visible, 400-800nm, with resolution R~350, using the SPRAT spectrograph on the Liverpool Telescope located at Roque de los Muchachos.
Liverpool Telescope
