TITLE: GCN CIRCULAR NUMBER: 24183 SUBJECT: LIGO/Virgo S190425z: SQUEAN Observation DATE: 19/04/25 15:11:29 GMT FROM: Myungshin Im at Seoul Nat U Myungshin Im (SNU), Gregory S. H. Paek (SNU), Gu Lim (SNU), Insu Paek (SNU), Suhyun Shin (SNU), Joonho Kim (SNU), Soojong Pak (KHU), Sungyong Hwang (SNU), Bomi Park (SNU), Sophia Kim (SNU), Changsu Choi (SNU), Chung-Uk Lee (KASI), Seung-Lee Kim (KASI), Hyung Mok Lee (KASI), on behalf of a larger collaboration We observed 30 host galaxy candidates in the 90% localization area of the BNS merger candidate, S190425z, detected by LIGO/Virgo (GCN #24168) using the SQUEAN instrument on the McDonald observatory's 2.1m telescope. The observation started at 2019-4-25 09:38:57 UT, and the images were taken in i-band with 120 sec exposure time. No obvious transient has been identified to a preliminary 3-sigma depth of i=20.0 AB mag. The list of the inspected targets is given below. NAME RA DEC IC4587 239.965057 25.940653 UGC10153 240.83136 20.636812 UGC10320 244.530502 21.066381 PGC58097 246.408646 16.455 2MASS+16590728-0544311 254.780334 -5.741986 UGC10016 236.370865 26.603144 PGC55801 235.374939 27.986473 PGC55774 235.152664 28.512449 2MASS+16585063-1557280 254.710999 -15.957801 2MASS+16582619-0319463 254.609146 -3.329548 2MASS+17004803-0510264 255.200165 -5.17402 2MASS+16572382-0147498 254.349258 -1.797175 2MASS+16574955-0156027 254.456467 -1.934085 2MASS+17030866-0237020 255.786118 -2.617223 2MASS+16550989+0551321 253.791245 5.858919 2MASS+16540875-0738073 253.536499 -7.635365 UGC10678 255.993729 24.177513 PGC58992 251.901932 8.752961 PGC1470081 247.533737 14.903552 PGC57472 243.084732 23.001947 PGC1688132 240.935242 23.482073 NGC6097 243.608948 35.109116 NGC5567 214.823303 35.138004 PGC51918 217.984253 33.642612 PGC1277972 252.051498 5.089275 PGC1112217 255.254517 -1.705736 IC1255 260.77243 12.69542 6dFJ1654568-153135 253.736633 -15.526299 2MASS+16520774-1703135 253.032288 -17.053755 PGC59300 254.266769 5.372032