TITLE: GCN CIRCULAR NUMBER: 6278 SUBJECT: GRB 070411: Magellan/Clay photometry DATE: 07/04/12 04:05:59 GMT FROM: Edo Berger at Carnegie Obs E. Berger (Carnegie), M. Modjaz, A. Garg, R. Kirshner, P. Challis (Harvard), and A. Rest (NOAO) report: "We obtained a 60 sec image in r-band with the LDSS3 instrument on the Magellan/Clay telescope on 2007 Apr 12.03 UT (4.57 hr after the burst). We detect the afterglow with r=20.8 mag relative to the USNO-B star located at RA=07:09:17.9453, DEC=+01:04:09.210 with R=17.6 mag."