TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3306 SUBJECT: GRB 050421: IR Observations DATE: 05/04/21 15:58:46 GMT FROM: Josh Bloom at Harvard/CFA J. S. Bloom (UCB) reports on behalf of a larger collaboration: "We observed the field of GRB 050421 (GCN 3296, GCN 3301) with the PAIRITEL 1.3m on Mt. Hopkins over several epochs. In a 502 sec exposure beginning on 2005-04-21 11:23:45 UT, we find a faint source in J,H,Ks, consistent with XRT position, located at: RA 20:29:00.94 DEC +73:39.19.2 (J2000; uncertainty ~ 0.5 arcsec) We have not checked the variability of this source so its identification as the afterglow cannot be confirmed at this time. We note that there is also a JHKs source just outside the XRT 5 arcsec error radius at (end figures): 02.01, 22.3." This message may be cited.