TITLE: GCN CIRCULAR NUMBER: 24461 SUBJECT: LIGO/Virgo S190510g: Lulin Optical Follow-up Observations DATE: 19/05/10 20:13:15 GMT FROM: Albert Kong at NTHU Po-Chieh Yu (NCU), Han-Jie Tan (NCU), Albert Kong (NTHU), Atharva Sunil Patil (NCU), Chow-Choong Ngeow (NCU), Wing-Huen Ip (NCU), on behalf of the Global Relay of Observatories Watching Transients Happen (GROWTH) collaboration We report observations of 81 galaxies in the 90% localization of the BNS merger candidate, S190510g, detected by LIGO/Virgo (GCN #24442; GCN #24448) using the Lulin One-meter Telescope (LOT) in Taiwan. The observation started at 2019-05-10 12:54:43 UT, ~10 hours after the trigger. The observations were conducted using the r-band filter with 180 second exposure time. By comparing with Pan-STARRS images, we do not detect transient candidates brighter than r~21 mag (AB). We thank the staff in Lulin Observatory for helping the observations. The galaxy coordinates are listed below. RA (hh mm ss.ss) Dec (dd mm ss.s) 13 00 30.12 -09 09 05.1 13 00 37.49 -07 48 41.1 13 00 52.36 -07 45 26.1 13 01 23.02 -08 59 37.6 13 02 12.79 -04 44 29.1 13 02 52.28 -04 48 03.1 13 03 38.53 -06 51 24.2 13 04 02.72 -08 43 33.5 13 04 09.43 -07 28 24.5 13 04 09.49 -07 19 24.5 13 04 42.00 -12 37 29.0 13 04 48.48 -04 22 26.8 13 05 00.24 -11 15 24.4 13 05 03.06 -11 12 48.8 13 05 08.16 -04 16 23.1 13 05 10.38 -10 40 25.7 13 05 12.72 -04 03 07.6 13 05 13.06 -11 21 30.7 13 05 20.26 -10 36 31.1 13 05 26.54 -06 20 25.1 13 05 28.69 -11 16 04.1 13 05 28.80 -11 16 04.1 13 05 30.07 -09 37 48.1 13 05 30.29 -10 26 18.1 13 05 35.04 -04 14 35.2 13 05 35.43 -07 13 59.1 13 05 41.00 -10 26 43.1 13 05 47.28 -03 59 07.1 13 05 51.84 -05 30 16.2 13 05 52.40 -05 22 12.4 13 05 56.88 -03 03 17.8 13 06 03.36 -12 22 28.2 13 06 04.57 -11 33 44.0 13 06 04.58 -05 22 30.4 13 06 04.80 -02 40 08.4 13 06 08.27 -05 22 40.3 13 06 11.37 -11 33 13.0 13 06 17.41 -07 45 42.3 13 06 21.36 -12 31 25.1 13 06 28.55 -06 51 11.3 13 06 32.34 -05 13 49.6 13 06 33.14 -07 23 50.3 13 06 37.68 -05 04 19.2 13 06 45.57 -08 08 03.9 13 06 45.84 -03 57 35.3 13 06 52.10 -06 31 05.9 13 06 58.32 -11 47 28.0 13 07 02.40 -04 37 05.9 13 07 04.80 -03 15 50.0 13 07 05.28 -11 55 48.0 13 07 17.06 -10 56 51.2 13 07 17.52 -04 54 11.7 13 07 19.64 -10 54 11.2 13 07 20.64 -05 17 03.1 13 07 26.00 -04 16 23.7 13 07 26.39 -06 42 24.2 13 07 30.55 -07 19 28.2 13 07 36.74 -02 44 25.7 13 07 37.30 -08 33 09.2 13 07 37.44 -01 11 35.3 13 07 41.28 -02 48 07.3 13 07 41.78 -07 36 13.2 13 07 42.00 -05 42 58.0 13 07 42.24 -06 24 53.8 13 07 42.62 -06 22 14.2 13 07 55.44 -06 25 41.2 13 07 57.12 -12 51 04.7 13 07 58.64 -12 11 21.7 13 07 59.28 -03 53 33.8 13 08 03.31 -05 23 27.8 13 08 10.87 -12 58 48.7 13 08 11.86 -04 31 09.8 13 08 16.21 -03 44 46.8 13 08 17.68 -07 02 37.2 13 08 20.91 -11 49 03.2 13 08 22.56 -11 24 51.2 13 08 24.72 -06 23 46.2 13 08 28.60 -06 22 11.2 13 08 29.04 -06 22 40.3 13 08 29.67 -12 26 32.9 13 08 32.40 -05 31 52.7 13 08 34.16 -10 06 39.2 13 08 35.20 -12 09 01.9 13 08 37.44 -12 05 26.2 13 08 38.15 -11 01 16.2 13 08 40.17 -06 47 17.2 13 08 42.67 -10 04 54.3 13 08 59.52 -05 16 45.8 13 08 59.52 -09 54 34.3 13 09 04.25 -07 13 52.3 13 09 04.33 -10 02 04.3 13 09 06.96 -05 18 37.4 13 09 18.31 -06 52 26.1 13 09 19.68 -05 21 43.2 13 09 21.47 -07 26 25.1 13 09 22.41 -13 35 58.6 13 09 30.48 -04 38 13.2 13 09 36.00 -04 17 35.5 13 09 36.97 -10 29 45.0 13 09 39.53 -06 57 44.0 13 09 39.84 -12 20 19.5 13 09 39.96 -12 20 19.6 13 09 42.20 -07 53 07.2 13 09 43.09 -03 04 51.9 13 09 45.36 -05 12 35.7 13 09 47.04 -03 05 26.6 13 09 51.12 -03 25 13.4 13 09 56.40 -03 31 02.6 13 10 02.15 -06 07 41.2 13 10 04.56 -03 05 11.2 13 10 06.42 -07 35 59.2 13 10 06.47 -12 15 38.8 13 10 12.81 -07 02 43.4 13 10 13.20 -05 52 47.9 13 10 14.28 -07 31 10.4 13 10 17.28 -03 47 12.5 13 10 21.75 -07 38 56.4 13 10 24.72 -11 41 13.2 13 10 27.39 -07 04 30.4 13 10 34.08 -05 52 13.8 13 10 37.44 -03 41 48.2 13 10 41.47 -04 39 34.6 13 10 44.16 -01 48 07.7 13 10 45.47 -12 34 54.5 13 10 46.08 -01 49 19.2 13 10 46.28 -06 02 11.1 13 10 48.93 -09 15 34.1 13 10 49.92 -10 52 29.4 13 10 50.53 -12 27 24.6 13 10 51.01 -12 18 23.6 13 10 51.37 -06 53 53.1 13 10 54.76 -13 05 46.6 13 10 55.92 -03 26 06.4 13 10 58.65 -11 55 37.6 13 11 00.70 -12 09 10.6 13 11 02.88 -04 57 06.8 13 11 06.00 -12 22 38.6 13 11 07.44 -12 13 14.9 13 11 08.13 -12 07 27.5 13 11 16.65 -07 16 19.5 13 11 20.84 -12 29 34.1 13 11 23.04 -05 53 16.5 13 11 28.32 -01 34 01.6 13 11 29.28 -02 28 24.3 13 11 29.92 -01 35 53.1 13 11 30.24 -05 22 58.8 13 11 30.48 -11 48 56.4 13 11 31.20 -03 23 46.0 13 11 34.19 -04 18 17.1 13 11 34.26 -09 06 03.5 13 11 41.36 -05 26 23.9 13 11 42.21 -10 38 57.0 13 11 42.43 -10 07 01.0 13 11 50.14 -08 52 26.0 13 11 54.62 -12 41 20.2 13 11 55.92 -12 05 52.4 13 12 00.07 -09 18 18.0 13 12 04.40 -12 52 35.2 13 12 06.72 -02 40 56.0 13 12 12.48 -01 05 42.5 13 12 20.89 -13 16 46.6 13 12 22.54 -12 34 28.6 13 12 26.16 -06 20 25.3