TITLE: GCN CIRCULAR NUMBER: 18759 SUBJECT: LIGO/Virgo G211117: La Silla - QUEST observations 2015 Dec 28, 29 DATE: 15/12/29 21:59:11 GMT FROM: David Rabinowitz at Yale U SUBJECT: LIGO/Virgo G211117: La Silla - QUEST observations 2015 Dec 28, 29 FROM: D. Rabinowitz, C. Baltay, N. Ellman (Yale), P. Nugent (LBNL) The La Silla-QUEST survey operating the 10-sq-deg QUEST camera on the 1.0m ESO Schmidt at La Silla, Chile has covered th e ~90% confidence area for LVC event G21117 between Dec +27 and -13 deg. Analysis is ongoing, and further survey observa tions are planned. One target (LSQ15bvw) has been detected with high confidence outside the 90% confidence region: LSQ Desig V-mag hh:mm:ss dd:mm:ss JD _________________________(J2000)___________________________ LSQ15bvw 18.8 02:08:15.97 15:02:52.80 2457385.6006 LSQ15bvw appears as an isolated source not visible in years 2012 and 2013. Observations made 2015 Oct 28 and 29 (V mag 19.2 on JD 2457384.6032 and V mag 18.8 on 2457385.6006) indicate that the object is brightening by ~ 0.5 mags per day. Several other sources have been detected with lower confidence. All appear as likely supernova near the center of distant (z>0.01) host galaxies : LSQ Desig V-mag hh:mm:ss dd:mm:ss JD _________________________(J2000)___________________________ LSQ15bvk 19.6 02:33:08.79 18:13:48.41 2457384.6297 LSQ15bvo 20.6 02:38:44.05 21:00:23.35 2457384.5775 LSQ15bvs 18.3 02:20:45.15 11:03:18.58 2457384.6032