TITLE: GCN CIRCULAR NUMBER: 25345 SUBJECT: Non-detection of DESGW-190814a in ZTF forced photometry DATE: 19/08/15 17:02:53 GMT FROM: Kishalay De at Caltech, GROWTH K. De (Caltech), M. M. Kasliwal (Caltech), I. Andreoni (Caltech) on behalf of the ZTF and GROWTH collaborations We performed forced photometry on ZTF images from 2019-08-15 UT at the location of DESGW-190814a reported in GCN #25336. The field was observed 3 times in r-band and 2 times in g-band, and no source was detected above a 5 sigma threshold at the reported location. The combined 5 sigma upper limit at the location of the source is g = 21.1 mag and r = 21.7 mag. Based on the i and z-band detections reported in GCN #25336, these upper limits indicate red colors of r - i > 1.1 mag and r - z > 1.4 mag. ZTF and GROWTH are worldwide collaborations comprising Caltech, USA; IPAC, USA, WIS, Israel; OKC, Sweden; JSI/UMd, USA; U Washington, USA; DESY, Germany; MOST, Taiwan; UW Milwaukee, USA; LANL USA; Tokyo Tech, Japan; IIT-B, India; IIA, India; LJMU, TTU, and USyd, Australia. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. GROWTH acknowledges generous support of the NSF under PIRE Grant No 1545949. Alert distribution service provided by DIRAC@UW (Patterson et al. 2019). Alert filtering and follow-up co-ordination is being undertaken by the GROWTH marshal system (Kasliwal et al. 2019). The ZTF forced-photometry service was funded under the Heising-Simons Foundation grant #12540303 (PI: Graham).