TITLE: GCN CIRCULAR NUMBER: 18549 SUBJECT: LIGO/Virgo G194575: LT Spectroscopy of iPTF candidates DATE: 15/11/01 09:55:02 GMT FROM: Iain Steele at Liverpool/JMU I.A. Steele, C.M. Copperwheat, A. S. Piascik (Liverpool JMU) report on behalf of a larger collaboration: Observations of 7 of the proposed iPTF candidates (GCN 18497) using the  SPRAT spectrograph of the 2.0 metre Liverpool Telescope (La Palma) have been obtained.   The spectral  resolution was R~350 and the wavelength range 4000 - 8000 Angstroms. iPTF-15dln was observed on 2015-10-28 at 00:24UT.  The transient can not be obviously  distinguished from the host galaxy in our acquisition images.  Our spectrum shows absorption  lines of the host galaxy with redshift z=0.051. iPTF-15dkk was observed on 2015-10-28 at 20:34UT.  The transient can not be obviously  distinguished from the host galaxy in our acquisition images.  Our spectrum shows absorption  lines of the host galaxy with redshift z=0.061. iPTF-15dkn was observed on 2015-10-28 at 21:09UT.  The transient can not be distinguished from the host galaxy in our acquisition images.  Our spectrum shows absorption lines of the  host galaxy with redshift z=0.074. iPTF-15dkm was observed on 2015-10-28 at 21:41UT.  Our spectrum shows broad H-alpha  emission and is consistent with a Supernova as reported in GCN 18536.   iPTF-15dmn was observed on 2015-10-28 at 22:15UT.  Our spectrum shows narrow emission  line features typical of an AGN at redshift z=0.056. iPTF-15dni was observed on 2015-10-28 at 23:08UT.  The spectrum shows weak H-alpha emission  and typical galaxy absorption lines.  Both the H-alpha emission and the absorption spectra have  redshift z=0.020. iPTF-15dnh was observed on 2015-10-29 at 01:16UT.  The transient can not be obviously  distinguished from the host galaxy in our acquisition images.  Our spectrum shows absorption  lines of the host galaxy with redshift z=0.056. Further analysis is ongoing. DisclaimerNone