TITLE: GCN CIRCULAR NUMBER: 18395 SUBJECT: LIGO/VIRGO G184098 : PESSTO classification of PS15cbm in the northern region DATE: 15/10/05 15:09:22 GMT FROM: S. J. Smartt at Queens U Belfast H. Campbell (Cambridge), J. Lyman (Warwick), M. Fraser (Cambridge), J. Anderson (ESO), C. Inserra (QUB), I. Manulis (Weizmann), K. Maguire (QUB), S. J. Smartt (QUB), K. W. +Smith (QUB), M. Sullivan (Southampton), S. Valenti (LCOGT), O. Yaron (Weizmann), D. Young, D. Wright (QUB), K. Chambers, M. Huber, E. Magnier, H. Flewelling, C. Waters, J. +Tonry, A. Schultz, N. Primak (IfA, University of Hawaii), C. Stubbs (Harvard) Following the Pan-STARSS discovery (Smartt et al, GCN 18394) of candidates in the G184098 northern error box, PESSTO, the Public ESO Spectroscopic Survey for Transient Objects (see Smartt et al. 2015, A&A, 579, 40 http://www.pessto.org), reports that PS15cbm is a type Ia supernova a t z=0.06 at +2-3w past maximum light. All observations were performed on the ESO New Technology Telescope at La Silla on the night of 2015-10-03, using EFOSC2 and Grism 13 (3985-9315A, 18A resolution). Classifications were done with SNID (Blondin & Tonry, 2007, ApJ, 666, 1024). Classification spectra can be obtained from http://www.pessto.org (via WISeREP).