TITLE: GCN CIRCULAR NUMBER: 6953 SUBJECT: GRB 071020A: IR Imaging with PAIRITEL DATE: 07/10/20 16:20:34 GMT FROM: Josh Bloom at UC Berkeley J. S. Bloom, D. A. Perley (UC Berkeley) and D. L. Starr (UC Berkeley, LCOGT) report: "We observed the field of the optical transient (Schaefer et al. GCN 6948) of GRB 071020A (Holland et al. GCN 6949) with the 1.3m PAIRITEL on Mt. Hopkins starting at 2007-10-20 09:18 UT (~2h16m after the GRB, once the field was within telescope limits). In a stack of 2190 sec total integration time (mean time = 2007-10-20 09:46 UT), we detect the source in the J-band at position: ra= 07:58:39.78 dec = +32:51:40.4 (J2000; rms uncertainty relative to 2MASS of 250 mas in each coordinate) with J=19.06 +/- 0.23 mag and H=18.71 +/- 0.30 (only marginally detected). The source appears to have faded in subsequent imaging." This message may be cited.