GCN Circular 35829

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

We observed the field of GRB 240225B (Nakajima et al., GCN 35796
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; Evans, GCN 35797
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; Joshi et al., GCN 35798
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; D'Ai et al., GCN 35810
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; Kawakubo et al., GCN 35811
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) using the Palomar 1-m telescope equipped with the 1-square degree infrared WINTER camera (Lourie et al., 2020) in the Y and J bands. Observations began at 2024-02-28T05:55:09 UTC (~2.4 days after the GRB) and consisted of 8 x 120 s exposures in each filter.

The images were processed using the WINTER data reduction pipeline (https://github.com/winter-telescope/mirar), with J-band image subtraction performed against reference images from the UKIRT Hemisphere Survey (Dye et al., 2017). 

We do not detect the GOTO-discovered counterpart (Gompertz et al., GCN 35805
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; Liu et al., GCN 35812
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; Malesani et al., GCN 35819
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; Wise et al., GCN 35820
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; Gompertz & Malesani, GCN 35824
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; Pankov et al., GCN 35826
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; Moskvitin et al., GCN 35828
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), setting the following upper limits (AB): Y = 18.3 mag and J = 18.8 mag.