TITLE: GCN CIRCULAR NUMBER: 45312 SUBJECT: EP260806a: ZTF serendipitous detection of ZTF26abmjjnm / AT 2026yeh DATE: 26/08/07 20:52:13 GMT FROM: akashjanaki98@gmail.com Akash Anumarlapudi (UNC CH), Robert Stein (UMD), Tomas Ahumada (NOIRLab), Aleksandra Bochenek (LJMU), Mansi Kasliwal, Lin Yan (Caltech), Michael W. Coughlin, Michael C. Davis (UMN), D. Y. Li, C.C.Jin, W. Yuan (NAO, CAS) report, on behalf of the ZTF collaboration. We report the serendipitous detection of ZTF26abmjjnm/AT 2026yeh by the Zwicky Transient Facility (Bellm et al. 2019, Graham et al. 2019). ZTF26abmjjnm is the optical counterpart to the X-ray transient EP260806a (GCN #45299), previously detected by GCNs #45300, #45302, #45303, #45304, #45306. It was first observed by ZTF at T0+12 hrs, resulting in detections in g,r bands. With g = 18.69 +/- 0.09 AB and r = 18.93 +/- 0.09 AB the source appears blue. Previous observations, roughly 4 days prior, resulted in non-detection at the location of ZTF26abmjjnm with g, r > 19.9 AB. Based on observations obtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope at the Palomar Observatory as part of the Zwicky Transient Facility project. ZTF is supported by the National Science Foundation under Award #2407588 and a partnership including Caltech, USA; Caltech/IPAC, USA; University of Maryland, USA; University of California, Berkeley, USA; University of Wisconsin at Milwaukee, USA; Cornell University, USA; Drexel University, USA; University of North Carolina at Chapel Hill, USA; Institute of Science and Technology, Austria; National Central University, Taiwan; Operations are conducted by Caltech's Optical Observatory (COO) and Caltech/IPAC. View this GCN Circular online at https://gcn.nasa.gov/circulars/45312. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...