TITLE: GCN CIRCULAR NUMBER: 39098 SUBJECT: GRB 250129A: TNG NIR afterglow detection DATE: 25/01/30 13:08:07 GMT FROM: Matteo Ferro at INAF-OAB matteo.ferro@inaf.it

M. Ferro, R. Brivio, P. D'Avanzo, S. Covino (INAF-OAB), A. Rossi (INAF-OAS), D. B. Malesani (DAWN/NBI & Radboud Univ.), A. Melandri (INAF-OAR), G. Mainella e M. Cecconi (INAF-TNG) on behalf of the CIBO collaboration report:

We observed the field of the GRB250129A detected by the Swift (Beardmore et al., GCNC 36556) with the Italian 3.6m TNG telescope equipped with the near-infrared camera NICS to follow up its afterglow. A series of images were obtained with the J and H filters starting on 2025-01-30T06:16:34 UT (i.e. 25.5 hours post T0). The afterglow (Lipunov et al., GCN 39070; Schneider et al., GCN 39071; Gompertz et al., GCN 39072; Izzo et al., GCN 39073; Izzo et al., GCN 39074; Francile et al., GCN 39075; Ghosh et al., GCN 39077; Schneider et al., GCN 39078; Brivio et al., GCN 39079; Heintz et al., GCN 39081; Siegel et al., GCN 39085; Zheng et al., GCN 39090; Schlekat et al., GCN 39091; Antier et al., GCN 39096; Odeh et al., GCN 39097) is detected in the co-added image with a preliminary result of H(Vega)~16.7 mag (calibrated against the 2MASS catalogue).

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