TITLE: GCN CIRCULAR NUMBER: 20526 SUBJECT: LIGO/Virgo G270580: Liverpool Telescope classification of EM candidates DATE: 17/01/25 16:41:59 GMT FROM: Chris Copperwheat at LJMU ArI From C.M. Copperwheat (LJMU), A.S. Piascik (LJMU), D.Steeghs (Warwick) and I.A. Steele (LJMU) on behalf of a larger collaboration. We report the following Liverpool Telescope follow-up observations of EM candidates reported to the collaboration in GCN 20518. Observations were made with the SPRAT spectrograph, and supernova classifications were obtained using SNID (Blondin & Tonry, 2007, ApJ, 666, 1024). PS17wt was observed on 2017-01-25 at 00:30 UT. Possibly some faint emission features - no clear evidence of transient distinct from host galaxy emission. PS17yt was observed on 2017-01-25 at 01:50 UT. The spectrum is consistent with a SN Type Ia at 9 days before peak, with z=0.069. Galaxy 2MASX J10035883+4902195 is at a 0.211 arcmin separation, and has catalogue z=0.069742. The classification of this object as a Type Ia is consistent with GCN 20521, which reports spectroscopic data obtained an hour prior to our observation. PS17tn was observed on 2017-01-25 at 02:37 UT. The spectrum is consistent with a SN Type Ia at 2 days before peak, with z=0.040. Galaxy 2MASX J09431321+4118581 is at a 0.099 arcmin separation, and has catalogue z=0.044759. PS17ua was observed on 2017-01-25 at 03:12 UT. The spectrum is consistent with a SN Type Ia at 1 day before peak, with z=0.048. Galaxy 2MASX J09441179+3250341 is at a 0.102 arcmin separation, and has catalogue z=0.045336. PS17of was observed on 2017-01-25 at 03:49 UT. The spectrum is consistent with a SN Type II at 15 days after peak, with z=0.031. -- ------------------------------------------------------ C.M.Copperwheat Astrophysics Research Institute, Liverpool John Moores University ------------------------------------------------------ http://telescope.livjm.ac.uk ------------------------------------------------------ Email: c.m.copperwheat@ljmu.ac.uk Tel: +44 (0)151 231 2914 Fax: +44 (0)151 231 2921 ------------------------------------------------------