TITLE: GCN CIRCULAR NUMBER: 18394 SUBJECT: LIGO/Virgo G184098: ongoing Pan-STARRS search for optical transients DATE: 15/10/05 15:03:34 GMT FROM: S. J. Smartt at Queens U Belfast S.J. Smartt, K. W. Smith, (Queen’s University Belfast), K. Chambers, M. Huber, E. Magnier, H. Flewelling, C. Waters, J. Tonry, A. Schultz, N. Primak (IfA, University of Hawaii), D. Young, D. Wright (Queen’s University Belfast), C. Stubbs (Harvard) Following our reports of Pan-STARRS observations of the field of LIGO/Virgo G184098, and identification/classification of transients (GCN18362, GCN18372, also see Steele et al. GCN18371). We report further imaging has been continuing in the localisation region of the ‘LIB_skymap’, pushing east south into the higher probability regions. Eight transients have been discovered. All are likely supernovae/AGN which are in the field but unrelated to the GW source. A summary is given below and a sky map is being uploaded to the GraceDB for visualisation. Name | RA (J2000) | Dec (J2000) | Disc. Date | Disc Mag | filter | z and SpType PS15ccw | 08 57 30.60 | +04 31 56.1 | 20150917 | 19.31 | i |0.072 PS15cbm | 08 49 19.85 | +03 48 17.8 | 20150917 | 18.55 | i |0.059 Ia PS15ccx | 08 18 03.91 | +04 18 04.2 | 20150919 | 19.42 | z |0.097 Ia PS15cci | 09 13 22.76 | +06 10 47.3 | 20150919 | 18.32 | i |0.055 Ia PS15ccv | 08 55 23.05 | +04 41 19.0 | 20150922 | 19.57 | i |0.071 PS15cel | 09 34 11.58 | +05 46 45.2 | 20150923 | 19.53 | i |... PS15cej | 09 35 19.41 | +10 11 50.7 | 20151002 | 18.13 | i |0.049 PS15cek | 09 36 41.04 | +10 14 16.2 | 20151002 | 17.24 | z |0.06 AGN The mag is the discovery AB magnitude. The reported redshift is the spectroscopic redshift of the apparent host galaxy from SDSS DR12 or that from the transient. P15cek is the variable core of SDSS J093641.05+101415.9 which has an SDSS spectrum showing AGN/QSO characteristics. The host of PS15cel has no spectroscopic redshift reported, but from the data in hand, appears likely to be a supernova.