TITLE: GCN CIRCULAR NUMBER: 6861 SUBJECT: GRB 071010: Keck Observations of the Afterglow DATE: 07/10/10 05:37:15 GMT FROM: Josh Bloom at UC Berkeley J. S. Bloom, D. A. Perley, M. Modjaz, D. Poznanski (UC Berkeley), H.- W. Chen (U Chicago), and J. X. Prochaska (UCSC) report: "We have conducted preliminary imaging with the Keck I telescope (+LRIS) of the afterglow seen in TAROT (Klotz et al. GCN 6860) of GRB 071010 (Moretti et al. 6859). In the first set of short exposures (~100 sec) in R and G bands (starting at 04:48:34 UT) we detect a source near that position with a magnitude comparable to the faintest detectable DSS sources (corresponding to R~20 - 21 mag). We report a refined position (+/- 300 mas relative to USNO B1.0): ra= 19:12:14.624 dec= -32:24:07.16 J2000 The offset from the star at 19:12:17.121, -32:24:18.65 to the afterglow is 31.62" W, 11.49 "N. Spectroscopy is underway and reports from that analysis are forthcoming (the continuum is detected to the atmospheric cutoff in the blue, implying z<~2)." This message may be cited. We thank A. Klotz for helpful conversations regarding the TAROT afterglow detection.