TITLE: GCN CIRCULAR NUMBER: 6780 SUBJECT: GRB 070911: PAIRITEL IR Observations DATE: 07/09/12 21:45:33 GMT FROM: Nat Butler at MIT/CSR N. Butler, D. Starr, J. S. Bloom (UCB) report: In simultaneous J, H, and Ks band observations of the GRB 070911 field (Krimm et al.; GCN 6777) starting on September 11 08h53m33s UT, 2 hrs, 56 min after the burst, we find no new sources in the XRT error region (Stratta et al.; GCN 6779). We derive the following limiting magnitudes: J > 16.5 mag, H > 16 mag, and Ks > 16 mag. This message may be cited.