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GCN Circular 37915

Subject

GRB 241026A: J-band observations with WINTER

Date

2024-10-27T21:24:29Z (5 months ago)

From

Geoffrey Mo at MIT <gmo@mit.edu>

Via

Web form

Geoffrey Mo (MIT), Tomas Ahumada (Caltech), Benjamin Schneider (MIT), Viraj Karambelkar (Caltech), Danielle Frostig (CfA), Robert Stein (Caltech), Nathan Lourie (MIT), Robert Simcoe (MIT), and Mansi Kasliwal (Caltech) report:

We observed the field of GRB 241026A (Fermi GBM Team, GCN 37894

; Melandri et al., GCN ; Li et al., GCN ; D'Avanzo et al., GCN ) 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 were triggered automatically and began at 2024-10-27T01:39:58 UTC (~3.0 hours after the GRB), consisting of 15 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

We do not detect a source at the optical and enhanced Swift/XRT counterpart location (Evans et al., GCN 37897

; Lipunov et al., GCN ; Moskvitin et al., GCN ; Watson et al., GCN ; Zheng et al., GCN ; Osborne et al., GCN ; Shrestha et al., GCN ). We obtain the following 5-sigma upper limit: J ~ 18.2 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.