TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3310 SUBJECT: GRB 050421: Further Analysis of IR imaging DATE: 05/04/21 19:00:29 GMT FROM: Josh Bloom at Harvard/CFA C. Blake and J. S. Bloom report on behalf of a larger collaboration: "Following further analysis of ~2000 seconds of J,H,Ks observations of the field of GRB 050421 (GCN 3296, GCN 3301) with the PAIRITEL 1.3m on Mt. Hopkins we cannot confirm variability in the source reported in GCN 3306. Furthermore, analysis of our full J,H,Ks data set from UT April 21 does not reveal any sources detected at >3 sigma within the XRT error-circle." This message may be cited.