TITLE: GCN CIRCULAR NUMBER: 24274 SUBJECT: LIGO/Virgo S190425z: Lulin Observations of Counterpart Search DATE: 19/04/27 09:17:29 GMT FROM: Albert Kong at NTHU Han-Jie Tan (NCU), Po-Chieh Yu (NCU), Atharva Sunil Patil (NCU), Chow-Choong Ngeow (NCU), Albert Kong (NTHU), Wing-Huen Ip (NCU) On behalf of Global Relay of Observatories Watching Transients Happen (GROWTH) collaborations We report observations of 58 galaxies in 90% localization of the BNS merger candidate, S190425z, detected by LIGO/Virgo (GCN #24168) using the Lulin One-meter Telescope (LOT) in Taiwan. The observation started at 2019-04-25 14:11:07 UT, ~5.9 hours after the trigger. All images were taken in R-band with 180 second exposure time. No significant transient can be identified brighter than R~20 mag (AB). The galaxy coordinates are listed below. We thank the staff in Lulin Observatory for helping the observations. 195.2782 +39.841 195.8646 +53.532 196.3275 +31.442 197.0104 +53.936 200.6963 +32.623 206.5110 +55.716 206.5117 +55.715 212.2203 +33.532 212.8712 +55.122 214.8233 +35.138 216.1732 +55.706 217.8031 +35.332 220.4162 +36.647 221.4388 +32.630 224.0184 +45.405 225.3241 +31.875 226.3790 +30.911 229.1854 +7.0222 32.0402 +43.007 233.1953 +40.223 233.4227 +28.145 234.6793 +30.671 236.9750 +25.730 237.0115 +25.439 237.4094 +42.034 238.7582 +41.578 239.0813 +24.747 239.8704 +39.828 243.6089 +35.109 243.9256 +19.638 244.1279 +35.708 244.5305 +21.066 244.8738 +18.480 245.7836 +19.006 246.1423 +21.195 246.4086 +16.455 247.4369 +40.812 247.5337 +14.904 248.3241 +35.342 248.5431 +19.634 249.0647 +10.843 249.3963 +11.733 250.0136 +15.883 250.1398 +8.988 251.5005 +7.189 251.5155 +9.283 252.3932 +9.783 252.4388 +4.278 252.4483 +4.932 252.7889 +7.677 253.2453 +2.401 253.2702 -16.291 253.7912 +5.859 254.1937 -1.962 254.3263 +0.570 254.3493 -1.797 254.3984 -1.796 256.2616 -4.596