GCN Circular 20809
Subject
LIGO/Virgo G275404: Liverpool Telescope classification of EM candidates
Date
2017-03-03T17:16:51Z (8 years ago)
From
Chris Copperwheat at LJMU ArI <c.m.copperwheat@ljmu.ac.uk>
C.M.Copperwheat (LJMU), I.A.Steele (LJMU) and A.S.Piascik (LJMU) report on
behalf of
D.Bersier (LJMU), M.Bode (LJMU), C.Collins (LJMU), M.Darnley (LJMU),
D.Galloway (Monash), A.Gomboc (Nova Gorica), S.Kobayashi (LJMU), A. Levan
(Warwick), P.Mazzali (LJMU), C.Mundell (Bath), E.Pian (Pisa), D. Pollacco
(Warwick), D. Steeghs (Warwick), N.Tanvir (Leicester), K. Ulaczyk
(Warwick), K.Wiersema (Leicester)
and the GROWTH (Global Relay of Observatories Watching Transients Happen)
collaboration.
---
We report the following Liverpool Telescope follow-up observations of EM
candidates originally reported in GCN #20790. Observations were made with
the SPRAT spectrograph, and supernova classifications were obtained using
SNID (Blondin & Tonry, 2007, ApJ, 666, 1024).
iPTF17bqh was observed on 2017-03-02 at 23:58UT. The spectrum is generally
featureless with some weak hints of Balmer lines in absorption, so we
believe this source to be a dwarf nova in outburst.
iPTF17bpt was observed on 2017-03-03 at 02:12UT. Based on a
weather-affected spectrum we classify this transient as a type Ia SN at +18
days with z=0.595.