TITLE:   GCN CIRCULAR
NUMBER:  46260
SUBJECT: GRB 261113A: TNG NIR afterglow detection
DATE:    26/11/13 23:44:05 GMT
FROM:    Riccardo Brivio at INAF-OAB <riccardo.brivio@inaf.it>

R. Brivio, P. D'Avanzo (INAF-OAB), D.B. Malesani (DAWN/NBI and Radboud), A. Melandri (INAF-OAR), V. Lorenzi, H. Stoev (INAF-TNG) report on behalf of the CIBO collaboration:

We observed the field of GRB 261113A, detected by SVOM/ECLAIRs (Saccardi et. al., GCN 46244) with the Italian 3.6m TNG telescope equipped with the near-infrared camera NICS.                    
The observations were carried out in the J and K bands, started on 2026-11-13 at 19:07:27 UT (i.e. 4.6 hr after the burst), and lasted for about 1 hr.

From preliminary photometry, we detect the optical/NIR counterpart (Lin et al., GCN 46247; Lei et al., GCN 46248; Li et al., GCN 46249; Yin et al., GCN 46250; Chen et al., GCN 46251; Wu et al., GCN 46252; Zhao et al., GCN 46253; Li et al., GCN 46254; Saikia et al., GCN 46256; Adami et al., GCN 46257; Gress et al. GCN 46258; Izzo et al., GCN 46259) with the following magnitudes:

J = 19.2 +/- 0.1 (Vega; calibrated against the 2MASS catalogue),
 at a mid-time of 5.4 hr after the trigger;

K = 18.1 +/- 0.2 (Vega; calibrated against the 2MASS catalogue),
 at a mid-time of 4.9 hr after the trigger.