TITLE: GCN CIRCULAR NUMBER: 39170 SUBJECT: GRB 250205A: REM NIR upper limit DATE: 25/02/06 13:36:20 GMT FROM: Matteo Ferro at INAF-OAB matteo.ferro@inaf.it

M. Ferro, R. Brivio, P. D’Avanzo, S. Covino, D. Fugazza (INAF-OAB) report on behalf of the REM team:

We observed the field of GRB 250205A detected by SVOM (Saccardi et al., GCN 39154) and Einstein Probe (Liu et al., GCN 39165) with the REM 60cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the J, H, K bands, starting on 2025 February 06 at 00:34:51 UT (i.e. 3.17 hours after the trigger), and lasting for about 1 hour. From preliminary photometry we do not detect any NIR counterpart consistent with the candidate optical/NIR afterglow (Gompertz et al., GCN 39156; Schneider et al., GCN 39157; Palmerio et al., GCN 39159; de Ugarte Postigo et al., GCN 39160; Watson et al., GCN 39162; Busmann et al., GCN 39169), down to the following 3sigma magnitude upper limit:

H > 16.5 (Vega; calibrated against the 2MASS catalogue) at a mid-time of t - t0 = 3.6 hr after the trigger.

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