TITLE: GCN CIRCULAR NUMBER: 26817 SUBJECT: LIGO/Virgo S200115j: LCO upper limits for ZTF20aafqvyc/AT2020yq from the McDonald Observatory 1-m telescope DATE: 20/01/19 17:27:35 GMT FROM: Tomas Ahumada at U. of Maryland Tomas Ahumada (UMD), Michael Coughlin (UMinn), Shreya Anand (Caltech) report on behalf of the ZTF and GROWTH collaborations On UT 2020-01-19, we imaged ZTF20aafqvyc/AT2020yq (Anand et al. GCN 26767) found in the localization region of LIGO/Virgo S200115j (GCN 26759, GCN 26807) with the Sinistro camera on the 1-m LCO Global Telescope Network (LCOGT, Brown et al., 2013). We obtained a series of 3 exposures of 300 s in g-, r- and i-bands. After stacking the data, no source is detected at the source location down to a 3 sigma limits of g = 22.6 AB mag , r = 21.8 AB mag and i = 20.9 AB mag.