GCN Circular 37805
Subject
GRB 241017A: J-band upper limit from WINTER
Date
2024-10-17T16:16:07Z (7 days ago)
From
Benjamin Schneider at MIT <bschn@mit.edu>
Via
Web form
Viraj Karambelkar (Caltech), Benjamin Schneider (MIT), Geoffrey Mo (MIT), Robert Stein (Caltech), Tomas Ahumada (Caltech), Nathan Lourie (MIT), Danielle Frostig (CFA), Robert Simcoe (MIT), and Mansi Kasliwal (Caltech) report:
We observed the field of the SVOM/ECLAIRs GRB 241017A (Le Provost et al, GCN 37799) 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).
Our observations began at 2024-10-17T07:40:52 UTC (~3.7 hours after the GRB trigger) and consisted of 30x120s exposures. The images were processed using the WINTER data reduction pipeline (https://github.com/winter-telescope/mirar, https://doi.org/10.5281/zenodo.10888436), with image subtraction performed relative to J-band images from the UKIRT Hemisphere survey (Dye et al., 2017).
Our observations covered 95% of the SVOM/ECLAIRs statistical error circle. In the stacked and subtracted images, we do not detect any new source down to a 5-sigma depth of J ~ 19.3 mag (AB).
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.