TITLE: GCN CIRCULAR NUMBER: 11469 SUBJECT: GRB 101219A: Magellan NIR observations DATE: 10/12/19 12:04:51 GMT FROM: Ryan Chornock at Harvard R. Chornock, W. Fong, E. Berger (Harvard), and E. Persson (Carnegie) report: We observed the field of the short-hard burst GRB 101219A (Gelbord et al., GCN 11461) with FourStar on the 6.5-m Magellan Baade telescope. Observations in the J band began at 03:43:20 UT, 1.2 hours after the BAT trigger time. The source in the XRT error circle found by Perley et al. (GCN 11464) is clearly detected in our images, at a preliminary magnitude of J=21.6 in comparison to 2MASS stars in the field. The object is clearly extended in our images (seeing <0.5"), so it is likely the host galaxy and is not dominated by an afterglow, consistent with the non-detection of fading in the optical (Cenko et al., GCN 11468).