TITLE: GCN CIRCULAR NUMBER: 25358 SUBJECT: LIGO/Virgo S190814bv: No Candidates Found in Wide-Field Infrared Search with Palomar Gattini-IR DATE: 19/08/16 04:21:03 GMT FROM: Matthew Hankins at Caltech M. Hankins (Caltech), K. De (Caltech), M. Coughlin (Caltech), M. M. Kasliwal (Caltech), S. M. Adams (Caltech), I. Andreoni (Caltech), S. Anand (Caltech), M. Sharma (Caltech), L. Singer (NASA GSFC), T. Ahumada (UMD), A. Moore (ANU), J. Soon (ANU), M. Ashley (UNSW), T. Travouillon (ANU) report on behalf of the Palomar Gattini-IR team and the larger GROWTH (Global Relay of Observatories Watching Transients Happen) collaboration We report wide-field near-infrared follow-up observations of the localization region of the gravitational wave event S190814bv (GCN 25324, GCN 25333) by the Palomar Gattini-IR survey (Moore and Kasliwal 2019). Gattini-IR is a newly commissioned near-IR camera with a field of view of 25 square degrees mounted on a robotic 30 cm telescope at Palomar observatory. We started customized Target of Opportunity observations at UT 2019-08-15 08:07. The tiling was optimally determined and triggered using the GROWTH Target of Opportunity marshal (Coughlin et al. 2019a, Kasliwal et al. 2019b). We imaged a total of 95.9 square degrees, covering 89.5% of the probability region of the event for 4 to 7 epochs until UT 2019-08-15 12:09. Each field visit consisted of a sequence of 50 dithered images each with 8 second exposures. These data were processed and stacked with the Palomar Gattini-IR data reduction pipeline (De et al., in prep.). The typical limiting magnitude of each field visit (400s second exposure time) was between 16.5 and 17.0 AB mag in J-band. The average limiting magnitude from stacking all data taken during these observations is ~ 17.5 AB mag in J-band. No viable counterparts without previous history of variability were identified in the single epoch stacks within the survey region.