TITLE: GCN CIRCULAR NUMBER: 25344 SUBJECT: LIGO/Virgo S190814bv: no counterpart candidates in Keck I MOSFIRE imaging DATE: 19/08/15 16:57:58 GMT FROM: Jonathan S. Brown at UCSC J. S. Brown, R. J. Foley, D. A. Coulter, C. D. Kilpatrick, K. Siellez, C. Rojas-Bravo, G. Dimitriadis, M. R. Seibert (UCSC), J. S. Bloom, D. Kasen (UCB), and D. A. Howell (LCO/UCSB) Report on behalf of the 1M2H and the UC-NASA-Keck collaborations: In the process of searching the localization region of LIGO/Virgo S190814bv (LIGO/Virgo Collaboration, GCN #25324), we obtained 30-second J-band exposures of the following regions with the Multi-Object Spectrometer For Infra-Red Exploration (MOSFIRE) on the Keck I telescope on Maunakea. Observations began at approximately UT 2019-08-15 13:10. The field of view is roughly 6.1'x6.1'. The approximate center of each image is noted in the table below. The first two fields correspond to the fields of DESGW candidates AT2019nme and AT2019nmd, respectively (GCN #25336). The remaining fields were prioritized according to the relative probability of potential host galaxies (Coulter et al. 2017, Science, 358, 1556). Visually inspecting our images and comparing to PS1 and DECaLS images of the same fields, we did not detect any sources in J-band at the expected location of the candidates reported in GCN #25324, nor did we detect any sources without optical counterparts with a limiting magnitude of J~20 mag. RA (J2000) | DEC (J2000) 00 50 32.56 | -22 13 33.70 00 51 29.00 | -22 28 16.96 00 48 21.86 | -25 07 36.52 00 47 05.25 | -24 14 19.32 00 53 57.74 | -24 32 35.30 00 51 29.86 | -24 38 32.97 00 52 41.58 | -25 44 01.86 00 50 56.15 | -23 38 53.38 00 51 18.76 | -26 10 05.01 01 34 29.64 | -32 48 22.46 We thank the staff of Keck observatory including Jim Lyke, John O'Meara, Randy Campbell, and Hilton Lewis for facilitating these Target-of-Opportunity observations.