GRB 200205B: ESO/NTT near-infrared imaging

The optical counterpart of GRB 200205B (Evans et al., GCN 26993; Strausbaugh & Cucchiara, GCN 26995; Vielfaure et al., GCN 26998) was observed with the ESO New Technology Telescope equipped with the SofI imager on two different epochs during the night of 2020 Feb 5-6. Observations were carried out under ESO program 0104.D-0945(A) (PI Russell). The afterglow is well detected in the first epoch in the J and Ks filters, and is marginally detected in the second observation. Calibrated to the 2MASS survey, we obtain the following magnitudes (Vega): K = 18.07 +- 0.10 on Feb 6.164 UT (0.356 days after the GRB) J = 19.43 +- 0.10 on Feb 6.145 UT (0.338 days after the GRB) J = 20.57 +- 0.33 on Feb 6.368 UT (0.561 days after the GRB)