{
  "eventId": "EP260924a",
  "submittedHow": "web",
  "circularId": 45742,
  "eventType": [
    "X-ray Transient"
  ],
  "format": "text/markdown",
  "body": "Tanishk Mohan (IITB), Geoffrey Mo (Caltech/Carnegie), Viraj Karambelkar (Columbia), Benjamin Schneider (LAM), Tomas Ahumada (NOIRLab), Robert Stein (UMD), Danielle Frostig (CfA), Nathan Lourie (MIT), Robert Simcoe (MIT), and Mansi Kasliwal (Caltech) report:\n\nWe observed the field of EP260924a (Jiang et al., GCN 45737) in the near-infrared J band with the Palomar 1-m telescope, equipped with the 1.2-square degree WINTER camera (Lourie et al. 2020, Frostig et al. 2024).\n\nObservations began on 2026-09-25 at 06:20:22.162 UTC in the J band (8.5 hr after the EP trigger), consisting of 15*120 sec exposures. The images were processed using the WINTER data reduction pipeline implemented with mirar (https://github.com/winter-telescope/mirar, https://doi.org/10.5281/zenodo.13352565).\n\nWe do not detect any new source in the WXT localization in our stacked image.\nWe obtain the following 5-sigma upper limit: J = 19.19 mag (AB). \n\nWINTER (Wide-field INfrared Transient ExploreR) is a partnership between MIT and Caltech, housed at Palomar Observatory, and funded by NSF MRI, NSF AAG, the David and Lucile Packard Foundation, and the MIT Kavli Institute for Astrophysics and Space Research.",
  "createdOn": 1790333963790,
  "submitter": "tanishk.mohan@iitb.ac.in",
  "subject": "EP260924a: J-band upper limit with WINTER"
}