GCN Circular 37416

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 240905E (Dichiara et al., GCN 37397
Not found
 
 
; Zhang et al., GCN 37404
Not found
 
 
) in the near-infrared J-band with the Palomar 1-m telescope, equipped with the 1 square degree WINTER camera (Lourie et al. 2020). 

Observations began at 2024-09-06T02:54:16 UTC (~8.5 hours after the GRB) and consisted of 15 x 120 s exposures. The images were processed using the WINTER data reduction pipeline (https://github.com/winter-telescope/mirar). 

We do not detect any sources within the refined Swift/XRT error circle (Ferro et al., GCN 37406
Not found
 
 
), consistent with observations reported by other groups (Lipunov et al., GCN 37398
Not found
 
 
; An et al., GCN 37399
Not found
 
 
; Moskvitin et al., GCN 37401
Not found
 
 
; Shilling et al., GCN 37402
Not found
 
 
; Strausbaugh et al., GCN 37403
Not found
 
 
; Brivio et al., GCN 37408
Not found
 
 
; Fu et al., GCN 37409
Not found
 
 
; Adami et al., GCN 37412
Not found
 
 
; Wu et al., GCN 37413
Not found
 
 
; Odeh et al., GCN 37414
Not found
 
 
; Belkin et al., GCN 37415
Not found
 
 
). We also do not detect a source at the position of the potential CrAO OT candidate (Belkin et al., GCN 37415
Not found
 
 
). We obtain the following 5-sigma upper limit: J ~ 18.6 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 Lucille Packard Foundation, and the MIT Kavli Institute for Astrophysics and Space Research.