TITLE: GCN CIRCULAR NUMBER: 38221 SUBJECT: EP241113a : J-band observations with WINTER DATE: 24/11/14 18:57:48 GMT FROM: Tomas Ahumada Mena at Caltech tahumada@caltech.edu
Tomas Ahumada (Caltech), Geoffrey Mo (MIT), Benjamin Schneider (MIT), Viraj Karambelkar (Caltech), Danielle Frostig (CfA), Robert Stein (UMD), Nathan Lourie (MIT), Robert Simcoe (MIT), and Mansi Kasliwal (Caltech) report:
We observed the field of the EP-WXT and EP-FXT X-ray transient EP241113a (Liu et al., GCN 38211) in the near-infrared J-band with the Palomar 1-m telescope, equipped with the 1 square degree WINTER camera (Lourie et al. 2020, Frostig et al. 2024).
Observations began at 2024-11-14T11:44:10.899 UTC (~16.5 hrs after the X-ray transient) and consisted of 30 x 120 s exposures. The images were processed using the WINTER data reduction pipeline (https://github.com/winter-telescope/mirar, https://doi.org/10.5281/zenodo.13352565).
No source is detected in the FXT error region (Liu et al., GCN 38211), setting a 5-sigma upper limit of 18.5 mag (AB) in the J band.
WINTER (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.
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