{
  "createdOn": 1792193701618,
  "eventType": [
    "X-ray Transient"
  ],
  "eventId": "EP261015a",
  "submittedHow": "web",
  "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 EP261015a (Li et al., GCN 45956) 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 2026-10-16 at 05:43:44.591 UTC in the J band (16.47 hr after the WXT observation), consisting of 30*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 the optical counterpart reported by Corcoran et al., GCN 45955; Méndez et al., GCN 45960 and Ma et al., GCN 45963 in our stacked image.\nWe obtain the following 5-sigma upper limit: J = 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.",
  "subject": "EP261015a: J-band upper limit with WINTER",
  "circularId": 45967,
  "format": "text/plain",
  "submitter": "tanishk.mohan@iitb.ac.in"
}