TITLE:   GCN CIRCULAR
NUMBER:  20898
SUBJECT: LIGO/Virgo G275404: P200/DBSP Classification of iPTF Candidates
DATE:    17/03/17 22:06:10 GMT
FROM:    Mansi M. Kasliwal at Caltech  <mansi@astro.caltech.edu>

S. M. Adams, J. Jencson, K. Burdge, N. Blagorodnova, M. M. Kasliwal
(Caltech) and F. Taddia (OKC)

report on behalf of the iPTF (intermediate Palomar Transient Factory) and
GROWTH (Global Relay of Observatories Watching Transients Happen)
collaborations

On UT 2017-03-07 and 2017-03-16, we spectroscopically classified the
following iPTF optical transient candidates (LVC GCN#20790) using the
Double Beam Spectrograph (Oke & Gunn 1982) on the Palomar 200-inch Hale
Telescope. All spectra were reduced using the pyraf-dbsp pipeline (Bellm &
Sesar 2016) and spectral matching done using SNID and Superfit.

Name, Redshift, Classification, Notes
(2017-03-07)
iPTF17bps, z=0.109, SN Ia, best match is SN2006ev at +11d
iPTF17bpt, z=0.785, AGN  (but see LVC GCN # 20814)

(2017-03-16)
iPTF17bru, z=0.103, SN Ia, best match is SN1989B +13d
iPTF17bsi, z=0.031, SN II, best match is SN2004dj +0d  (consistent with LVC
GCN # 20814)