TITLE: GCN CIRCULAR NUMBER: 24322 SUBJECT: LIGO/Virgo S190426c: LOAO Observation DATE: 19/04/28 06:29:11 GMT FROM: Gregory SungHak Paek at SNU Gregory S.H. Paek (SNU), Myungshin Im (SNU), Hyun-Il Sung (KASI), Gu Lim (SNU), Joonho Kim (SNU), 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 23 host galaxy candidates with the 1.0-m telescope at the Lemonsan Optical Astronomical Observatory(LOAO) in the 90% updated localization area of S190426c, detected by LIGO/Virgo (GCN #24237). The observation started at 2019-04-27 09:14:26, and the images were taken twice in R-band with 120 sec exposure time. No obvious transient has been identified to a preliminary 3-sigma depth of R=20.8 AB mag. The list of the inspected targets is given below. NAME RA DEC 2MASS+20300804+5415120 307.533508 54.253361 2MASS+20232657+5347113 305.860718 53.786499 2MASS+20175967+5440389 304.498657 54.677479 2MASS+20292607+5411091 307.358643 54.185883 2MASS+20205571+5530336 305.232147 55.509338 2MASS+20355212+5549587 308.967194 55.832996 2MASS+20305041+5537391 307.710052 55.627537 2MASS+20183442+5619548 304.643433 56.331894 2MASS+20360197+5350457 309.008209 53.846035 2MASS+20363163+5824495 309.131805 58.41375 2MASS+20403391+5348447 310.141296 53.812439 2MASS+20262902+5827565 306.620941 58.465717 2MASS+20290191+5817016 307.257996 58.283779 2MASS+20243518+5606523 306.146606 56.114536 2MASS+20235181+6448514 305.965881 64.814285 2MASS+20431631+6211283 310.817993 62.1912 2MASS+21072317+6322504 316.846558 63.38068 2MASS+20323093+6451261 308.128906 64.857254 2MASS+20391049+6303489 309.793732 63.063591 2MASS+20563318+6814486 314.138275 68.246841 2MASS+20453544+6259029 311.397705 62.984146 2MASS+21011016+6334464 315.292358 63.579582 2MASS+20550853+6249236 313.785583 62.823235 The observation of host galaxy candidates and the analysis of the data are ongoing. We thank the LOAO opertator for performing the observation.