TITLE: GCN CIRCULAR NUMBER: 25374 SUBJECT: LIGO/Virgo S190814bv: No candidates from DCT galaxy targeted search and observations of DECam-GROWTH candidates DATE: 19/08/16 21:58:42 GMT FROM: Simone Dichiara at UMCP/NASA/GSFC S.Dichiara (UMD, NASA-GSFC), E. Troja (UMD, NASA-GSFC), S.B. Cenko (NASA-GSFC), P. Gatkine (UMD), A. Kutyrev (UMD, NASA-GSFC), J.M. Durbak (UMD), S. Veilleux (UMD), Gabriele Minervini (INAF-IAPS), Roberto Ricci (IRA Bologna) report on behalf of a larger collaboration: We observed LIGO/Virgo S190814bv (Mo et al, GCN Circ. 25324) using the Large Monolithic Imager (LMI) on the 4.3m Discovery Channel Telescope (DCT) at Happy Jack, AZ. Observations started on August 16, 10:06:18 UTC (about 1.54 days after the detection) with SDSS i and r filters. We selected the sample of galaxies from the GLADE v2.3 catalogue (Dalya et al. 2018). We observed 11 galaxies within the 90% error volume of S190814bv obtaining 3x90 sec exposures for each field in i-band and r-band The locations of the galaxies observed are: RA(J2000) DEC (J2000) Filter 00:53:14.256 -25:36:49.68 i,r 00:51:17.208 -25:32:01.32 i,r 00:50:52.416 -25:34:37.56 i,r 00:53:24.864 -25:49:36.48 i,r 00:51:36.648 -25:56:31.92 i 00:51:03.456 -25:58:56.64 i 00:51:15.768 -25:57:39.24 i 00:52:54.792 -26:02:28.68 i 00:52:41.880 -26:04:04.08 i 00:52:59.016 -26:03:03.60 i 00:50:01.104 -26:18:07.20 i Comparing our images against the archival Pan-STARRS images, we do not detect obvious counterparts. Our limiting magnitude is ~22 AB mag in each filter. We also observed some of the candidates reported by Andreoni et al. (GCN Circ. 25362). We detect the sources with the following magnitudes: Name Start Time (UT) Exposure Filter AB Mag ------------------------------------------------------- DG19sevhc 11:15:19 2x60 z' 19.72 +- 0.03 DG19sevhc 11:18:12 2x60 i' 20.13 +- 0.04 DG19qabkc 11:21:39 2x60 z' 20.64 +- 0.09 DG19wgmjc 11:25:09 2x60 i' 20.88 +- 0.07 ------------------------------------------------------- We note that the candidate DG19sevhc has a red color and appears to have brightened by ~0.7 mag in z band. Further observations are planned. We thank the staff of the Discovery Channel Telescope in particular Ishara Nisley for assistance with these observations.