TITLE: GCN CIRCULAR NUMBER: 38930 SUBJECT: GRB 250114A: LCO optical observations DATE: 25/01/14 08:41:29 GMT FROM: luca.izzo@inaf.it

D. B. Malesani (DAWN/NBI and Radboud Univ.), and L. Izzo (INAF-OACn and DARK/NBI) report:

We observed the field of GRB 250114A (Klingler et al., GCN #38927) with the Sinistro instrument mounted on the 1-m telescope of the LCO network, located at the Cerro Tololo, Chile. Observations started on 2025 January 14 at 07:48:10 UT (14.85 minutes after the GRB trigger). We obtained a series of 3x180 s images in the SDSS-r filter.

At the location of the Swift-UVOT afterglow, we detect a faint source. We measure a preliminary magnitude of r = 20.18 +/- 0.15 mag (AB), calibrated against nearby stars from the Pan-STARRS catalog. This value is consistent with TRT observations obtained at a similar epoch (An et al., GCN #38929).

This project has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement No 101004719.

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