TITLE:   GCN CIRCULAR
NUMBER:  20747
SUBJECT: LIGO/Virgo G274296: P200 classification of EM candidates
DATE:    17/02/26 07:31:27 GMT
FROM:    Mansi M. Kasliwal at Caltech  <mansi@astro.caltech.edu>

R. Lunnan (Caltech), D. Cook (Caltech), K. De (Caltech) and M. M. Kasliwal
(Caltech)

report on behalf of the iPTF and GROWTH collaborations

Under cloudy and windy weather conditions, the following classification
spectra were obtained with the Palomar 200-in telescope using the DBSP
spectrograph (Oke & Gunn, 1982, PASP, 94, 586).

ATLAS17aic (=iPTF17jg) was observed on 2017-02-23 13:03 UT. The spectrum
shows strong galaxy emission lines at z=0.013 and a broad P-cygni Halpha
profile, consistent with a Type II SN a few weeks after maximum light.

PS17bew (=iPTF17bbq) was observed on 2017-02-23 10:33 UT . The spectrum
shows broad Halpha emission, consistent with a Type II SN, confirming the
classification reported by PESSTO (ATel #10127).

iPTF17bdd was observed on 2017-02-23 11:48 UT. The spectrum is dominated by
galaxy light, as was also the case in the spectrum reported from Liverpool
Telescope (LVC GCN #20734).